I also have one of those in my 318iS but I opened it for a different reason and it's not the same at all.
My M3 is the automatic climate control (buttons) and I was having the controls stop responding, the fan changing speed for no obvious reason, and sometimes refuse auto mode or just shut off out of the blue and come back on next time the car was started.
The repair was simple.
Not sure about the rule on posting a link outside of maXbimmer but here goes, these were the 2 best write ups I found... there are also YouTube videos but I like to print out the instructions 'cause it's easier to look at when I have tools in my hands.
Hope it helps. Let me know if you need a capacitor, I've 14 spares ;-)