There is a subtle difference between performing a certain operation at the manufacturer's request, and offering to "fix" the piano. Unless the exact cause of the loose pins is obvious to you, I suggest that you, as the dealer's technician, write a letter with your recommendation to return the piano. Only then can you offer other possible solutions, with their cost, and with the caveat that since the cause cannot be located without disassembling the piano, your efforts ARE NOT GUARANTEED. I would not do ANYTHING to this piano unless the manufacturer instructed you IN WRITING to do it, and specifically accepted the risk of failure. This is an unusual circumstance, and there is no reason you should have to promise success and wind up eating the possible failure. Even if you have a lot of experience in general piano service, if you feel that someone else with a lot of rebuilding experience might be able to tell more about the possible success/failure, don't hesitate to "call in a specialist" at least for the assessment. This might be a favor to the manufacturer, the dealer, and yourself. Bob Davis
This PTG archive page provided courtesy of Moy Piano Service, LLC