I hope you mean a QRX, not QRS. They got it at hifiengine, it shows a fuse for the dial lamps, F 01, 5 amps. It also feeds a rectifier for about an 8 volt source that feeds the stereo light, also off the fuse. While at this age those lamps may have blown one at a time by now, you would have noticed it.

the cap in the protection, the failure mode is weird. They are usually 10 volts and sometimes go right across B to E of a transistor so they never charge more than like a half a volt. they get leakier and leakier over time. They are usually fed by a high value resistor, like 100K or more. I didn't look at that part of the circuit but since it is fine, fukit.

Not a badly designed piece. Full comp outputs, current source instead of a bootstrap, DC coupled. Theoretical peak RMS short tem power is 76.5 WPC. The rating is 30, so splitting the difference I would say you got about 1.5 dB or so dynamic headroom. It is probably over 3 dB for a couple milliseconds, but in real life not so much.

Tuner is pretty conventional, uses ceramic filters but still a standard ratio detector. No pilot cancel, but all that doesn't mean it doesn't sound good.

Tone controls OK, filters only 6 dB, don't use the filters. he variomatrix looks like a good thing, like Marantz varimatrix I would guess. You have control over the L+R attenuatoin in the rear.

I don't see amp strapping in it though, or pre out/main in.

Enough commentary, if it is QRX the manual is at hifiengine.com. It is probably ready for the FM to be tweaked, but it might not be so bad. Other than fixing the lights, if all the channels sound good I don't recommend anything. You could go in with an ESR meter and replace caps if you feel like it. Just never short the speaker wires because it has no current limiting at all.