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Powermatch ICV Not Okay

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Adam Roberts:
Hi guys, So I have 2 Bose Powermatch Amplifiers
1x 8500N
1x 4250N
Both displaying fault Power Supply Fault: ICV not OK! and User Warning - Clipping on Channel 1-8 (1-4 for 4250N)
I wondered if anybody had come across this before and what to actually look at and replace rather than shooting in the dark?
Also does anyone have the service manual for these?
Thanks
Adam

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