Runco PL-61cx / NEC 61MP1 - No picture after storage

[korneluk]

Folks,

I have a Runco PL-61cx (which is based on the NEC 61MP1) and it does not display a picture after having been in storage for a couple of years.
Remote control On/Off works, but I get no image on screen after trying all the diffeent video inputs.

Does anyone have a service manual available and/or recommendations as to what I should try first?

TIA,