I have this problem with my Nad amplifier. Yesterday the amplifier was in standby mode and i observed that it's starting to make relay clicks constantly. The relay clicks repeated in 2 seconds interval, the amber power led it's no longer lit, the power button not responding. Disassembling the amplifier i found that the clicking relay is the one on the volume and tone board. Measuring the 5v rail on main board i get 0.4v ascending to 1.8-2v synchronized with the relay clicks. If i disconnect the power supply board from the main board, i get stable 5v on power supply board. Any idea how to find the bad components? Thanks!