preamp Luxman 5c50 indicator has gone red DC offset

Thank you very much

just , by saying

"It’s usually straightforward to have it fixed up."

do you mean it is not very difficult for technician to fix it?

and what outputs should I measure with a DC voltmeter ?

You say "outputs" ; in my case, it is a preamp so there are several inputs and two preamp outputs (to the amplifier).

Should I measure these two preamp outputs?

(and there are also  2 tape outputs, to be exact)

Thank you

Set your meter to DC and measure each preamp main output between ground and positive (center). Ideally there should be no DC on the output jacks.

And could anybody tell me, what would cost to fix the problem and probably to recap the 5c50 preamp?

thank you