Kenwood Excelon KAC-x401m Goes Into Protection

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I have had this amp in my car for about a year. All of the sudden when
it comes on it goes straight into protection. I pulled it out and bench
tested it with just power. ground and switch and it still goes into
protect. I was told that my outputs are shot. So I opened it up and
checked the output transistors (or what I believed to be the output
transistors). They all tested with a high resistsnce between the leads.
Nothing looks burnt, all of the solder connections look sound and not
cracked. Would someone be able to point me in a direction on what to
test and how to do it? I really really loved this amp.

Thanks,
Todd