if it's just one input one channel, its likely something bad between the rca jack and the switch, and likely easily fixed. I'd worry a lot more if one channel didn't work on all inputs.
Any competent tech could diagnose and most probably fix it.
If it were me, I'd go for it, especially if I didn't need all inputs immediately.
Any competent tech could diagnose and most probably fix it.
If it were me, I'd go for it, especially if I didn't need all inputs immediately.