Well I bought a immaculate 96 bass Weltmeister with 11 Treble Registers and 5 bass, from the well known ebay seller in Bulgaria.
It arrived in 7 days with a weekend in between and was packaged very very well. Upon a first play I identified a issue with the "B" below middle "C" it played perfectly on the bellows out but sounded horrible on the compression stroke with a vibration and very flat, this was only on several of the couplers.
Contacted the seller and they said perfect when it left us, damaged in transit by the courier.
My heart fell through my boots at this point!
Anyway as I'm in a Rural area and 200miles away from anywhere who could take a look, I phoned Birmingham Accordions and spoke to Mitchell who had a listen over the phone and gave me some info on how to fix it!
Turned out after I removed the reed blocks it was a read lifting up on the compression stroke from its retaining wax. Most likely in transit with the old harder wax breaking away from the reed possibly from a bump/vibratation by the couriers
After removal and a rewax of the offending reed and a refit of the reed blocks and Treble case to the bellows, all was well on a run through of the treble and the registers.
Many thanks to Birmingham Accordions, a drink will be in the post next week Mitchell.