There's a service manual here.I scored a pair of Denon POA 1500 amplifiers today from a guy. Both have the black front, rosewood side panels. I've removed the panels to refinish them, and will install the LEDs tomorrow. This is a picture of one of the amps, but with half the meter bulbs burned out. Both amps work, though - performance and power-wise.
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There's a service manual here.