NAD C352 not turning on

Hello!
I recently got a non-functional NAD C352, and I plan to use it as a project to get better at electronics and amps.

When turned on, the orange light turns on, but it never turns green. If I’ve understood it correctly, it can’t get out of protection mode(?). I’ve fiddled around with the amp for several hours, but don’t know where to go next. Do any of you wonderful people know where to look? Are there for instance any specific capacitors I can check out which usually causes this problem?

All help is appreciated.