I'm not sure if you've tried restoring the defaults or if this helps.
Maybe it's the same procedure with yours.
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Restoring Defaults - Nuvo NV-P200 Series Product Manual [Page 50]
Nuvo NV-P200 Series Manual Online: Restoring Defaults. An important troubleshooting step is to restore defaults on a zone player. If a hard failure occurs, which results in a solid red LED, or the boot up process does not complete correctly, which will re- sult in a flashing white LED,...www.manualslib.com
Do you know why it went into protection mode?
I'm assuming you've checked for shorts and also I see a fuse via an online diagram have you checked it?
Its near the AC power cord port (although I'd think it wouldn't power on at all if it was blown)
Some amps and appliances only come out of protection mode automatically themselves when a fault is rectified and visa versa stay in protection mode when a fault still exists.