Hello!

Many of you might be familiar with this combo floppy model. The 3.5" unit might become unoperational.

The culprit is usually the rottig/leaking electrolytic capacitors. In the past I had one drive that was beyond repair. The leaked goo destroyed circuit traces and fried the controller ic, seemingly shorted Vcc to data lines.
This one was not that bad.

The electrolyte residue was removed fairly easily and had no damaged traces.

I removed most components around the bad capacitors since the goo got everywhere, even through the circuit vias to the other side of the pcb.