Emax 1 rack stereo ouput problems

[80sboy]

Hello - having a problem with my Emax in that the stereo outputs just go off  - if I give the rack a sharp whack on the side they'll come back on, but eventually go out again. I can hear a "clicking" when this happens so I'm thinking it's some sort of output relay? Does anyone know a good replacement for these?

[dr.c]

Check first the power supply connections to the board (connectors), and especially, the soldering of the connectors, they may get crackled after a long time. Take off the solder and resolder them. I don't thing there's anything else.