No sound from right channel. Tapping can make it come back

[Kjartan]

Hello, I've been having issues with my crack lately.

The sound comes and goes on the right channel. Tapping the amplifier can make it come back.
I've checked all the solders but can't find any  clear faults.

Are there any other items on the board that make the channel go out and come back by tapping on it?

[Julyan9]

The most likely and easiest first step is to reheat all the solders. If the sound come and goes when you agitate the plate it's usually a cold solder. Have you done the chopstick test? Use some cheap headphones and power the crack and poke around the solder joints with a wooden stick. If you hear a loud pop or crackling when poking around you have found the possible culprit.