Question Harman Kardon AVR 158 not working

[tonygvng]

Hello, i got my hands on an Harman Kardon AVR 158 and wanted some help with troubleshooting it.
Few years ago it was working perfectly and now it doesn't:
- When plugged to power the led turns orange and after a few seconds it becomes white, turning on by itself;
-The display and the led ring around the volume knob won't light up;
-The remote works but the avr won't do anything;
-The buttons on the front panel don't work;
The only thing to mention is that it stayed in a pretty humid enviroment but all the other devices that were around it are still working fine.

Appreciate any help, thanks!

 

[tonygvng]

Checked the power supply : +17v line sits at around 15.2v, 2.5v AC is 3.6v and the 4.3v AC is around 3.7v but randomly jumps. All the other lines are normal.