Sopunds like the seven chanel Bose amp that MB no longer supplies. TYhe seven individual amps are always screwing up. There is a place in South Florida that rebuiolds them. Or you can disassemble the amps and replace about 100 capacitors that are usually the problem

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician