power cuts out on receiver

I have a Marantz SR5002 A/V receiver. Have had for 8 years. Recently the power starting cutting out inexplicably ... the unit is plugged into a power surge protection unit with a few other devices, and all other devices continue to work fine. After the power cuts out to the unit, the red standby light blinks, but the unit does not come back online. I unplug the unit and wait a few minutes, plug it back in, and it works again for a while before failing. Is there a worn component maybe? Would like to repair on my own because it's a long way to the nearest Marantz service center.

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@tc109 is the blinking of the standby light rapid (0.125 sec between blink) or slower (0.5sec between blink)


slower blink...