Why am I getting a blinking amber light? Sherwood RX-773 amp.

I have a 2009 Sherwood RX-773 (4 channel amp) that powers my home stereo speakers. The power indicator is normally solid blue light, but is now blinking amber. My limited research shows a bad power supply. I know nothing about fixing home electronics. I removed the cover and don't see anything fried. Happy to share pics or video of the behavior with anyone willing to help. I'm handy enough to pull and replace parts, but don't know what I'm looking at. Any help would be sweet. Text me at (585) 455-6602. Thanks, Brian