Zenith Tuner Needed

[jstout66]

Hey, does anyone know if any tuner rebuild shops are still in business? I used one place about 6 years ago and I think they closed.
Or... if anyone has a new or used one I can buy?
It's for a 1974 Zenith Sidekick B&W TV ( the denim one)
Chassis number is: 12CB12X
Model Number: unknown * damn Zenith stickers that fall off
Tuner part number: 175-2100-40A
I know the tuner is bad, because I used an old tuner subber and it works. I think a transistor or something shorted out.
Thanks!