Rockford protection LED blinking red

[BlkHawk73]

Rockford PBR300x1 powering Image Dynamics 10". Been working fantastic for 3 years. Pulled into garage everything perfect. Next morning I get the "heartbeat" from the sub. Protect LED blinking red instead of steady blue. Unhooked input and outputs and still happening. Unhooked power, plugged back in - same thing. Overnight gremlins?

Can't find my multimeter (picking up new one later) but initial thoughts?

Edited to add: New multimeter gives a reading of 10.4A to 11.0 so it's getting correct power. Guessing it's the amp itself. Now it's $150 for a new amp which is better I guess than having it be a wiring issue and have to start tracing back all the week hidden and routed wiring. can just get new amp, unplug this one, plug in current plugs and be going again (hopefully)

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