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

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

thank you