The MXR Dyna Comp is one of the best compressors out there. It is generally regarded as the compressor against which other compressors are compaired.
However, they have a double sided circuit board. This makes repairs a bit tricky. Desoldering in particular becomes a cumbersome task. Too much heat can make a pad lift off from the board.
The pedal below came into the shop with some intermittent problems after a previous potentiometer replacement. The pedal would cut out when the sensitivity knob was touched or manipulated. I found that the pads connecting the pot were starting to come loose. The solution was to make a solid electrical connection by putting in some jumper wires. These connected the lugs of the pot to the next component that the pot was supposed to be connected to. Some circuit tracing was required to figure out where to connect to.