Proton 550 Intergrated Amp

I just picked up one of these cheap and I understand that this amp paralelled some of the NAD stuff. Unfortunately, after receiveing the unit, it powers on but the protect light is on. Is there a simple way to get this amp out of the protect mode and render it usable as amp appears clean. Also would appreciate any info on this integated and the Proton 450 matching tuner, Thanks