Recently decided to cut my teethe on refurbing a espresso machine.

She was in a bad state, so I took it all apart and after lots of soaking and scrubbing got her back to a decent looking state.

My problem at the moment is that when I press the dosage button on the left group head it pops the fuse on the PC board. The right group head is absolutely fine. Just the the left.

Any help, tips or tricks I can look out for?

Mike