Introduzione
I can't find any tutorial on fixing Stratus Duo, So I decided to make one myself.
So my controller had fallen to the ground, and the R2 trigger ceased working.
I found that a cute little magnet triggers it, and it had fallen off from its encasement.
It's as easy as putting the magnet back. 
The only tricky part is the disassembling. 
Strumenti
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A screwdriver with...
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a Y 2.0 sized Tri-wing screwhead for the case
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and Phillips head for the motherboard.
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Some kind of pry (Prolly your nail 🤣, or your broke-ass credit card might do 💵)
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Pair of tweezers for delicate tasks
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Pair of dry, steady hands. (No caffeine for you!)
 
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There are 5 screws in the case, one of them is under the sticker (Circled in red)
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Pry open from the bottom (Red line) . don't pry from the top (orange line), otherwise, the fastening slot will be damaged. (photo showed in next step)
 
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The weight (yellow) is not fixed and can easily drop. Don't lose them.
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There's a non-functional plastic plug (green circle) that'll fall easily too. Be careful.
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You will find 2 connections. (red circle)
 
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The white strip is the data line. To disconnect, use a tweezer to (1) slide open the black button from both sides , then (2) pull the blue part.
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The tri-colored wire is the power line. Simply pull it up. (Don't forget it's orientation)
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Seperate the upper and lower controller case
 
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Your magnet won't rattle because it's attached somewhere else inside your controller.
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Find the bastard and pick it up with tweezers
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In this step, you may attempt to stick it back to the black encasement. But if you fail so, continue to the next step.
 
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Unscrew the 6 screws,
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Separate the lower analog motherboard first. Beware of the connection (Yellow)
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And then seperate the upper motherboard.
 
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Unscrew these 2 screws (red circle) to detach the trigger button. (From behind, duh!) (P.S. I was lazy and I didn't take photos of the disassembled button and motherboard 😶)
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You should have good access here. Now yell "GET BACK INTO THE F**KING MACHINE!!! MAGNET!!!" (If you know the reference😏)
 
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Reassemble it like lego.
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Reconnect the cables and try out the buttons with some controller testing site before screwing it back in
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Did I save the day for you? If yes, have a great day! If not, maybe you missed some steps. ¯\_(ツ)_/¯
 
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当重新组装你的设备时,请按照说明的相反顺序进行操作。