hifi engine

denon POA 3000Z

I bought the beast in 1992 when living in NJ USA. Years later the left side of the amp blew and several attempts to repair it failed eventually. Last time all components on left side replaced (located with great difficulty) and it worked for a few minutes before blowing again. Suspicion that the culprit could be the separate left hand sub amp, but not tested yet.
I would like to find either

1. Someone in the UK who can fix it, or
2. an amp with say right side blown, but left side good
3. Other suggestions!
4. I have the PRA 2000Z pre amp. Which power amp would best match this (limited budget)

Thanks alot