NAD 304 power indicator

Question

good day to you all, i have this NAD 304 stereo integrated amplifier, whose LED power indicator is not turning into green anymore, it stays red for a long period of time. i read in the manual that it is in protect mode but the relays wont switch to green. i want to know if this is normal and leave it on till it turns green? or i should get it fixed to a repair shop already? thanks