HP34C Repair

[javico]

Hi All,
I'm the proud owner of an HP-34C which was in pristine condition till last week. Unfortunately now for some reason, some keys are unresponsive, and the unit is responding erratically without working correctly. I've tried with a new set of batteries, but the issue is still there.
Does anyone know someone that repairs these units? I've been searching on the forum, and I've read negative feedback on "Bruce" from vintagecalculatorrepair. If someone can put me in the right direction, I would appreciate it.
Cheers,
Javier

P.S: I've also got some HP41's card readers that would benefit from a repair service.