Sony TV channel stuck on 56 I need it on channel 3

Question

I have a 1986 Sony TV model number KV-2775R. We don't have the remote control for it. We have been using the Cable remote and when we first got cable on it, it took the TW Tech about 20 min. and he finally got the TV on channel 3, but he didn't know how he got there. This time when I started messing with it the channels jumped from 2 to 4 and on up about 10 to 15 channels ending on 64. I gave the remote to my husband an somehow he got it stuck on channel 56 ( and he doesn't know how?). The nobs and buttons on the TV itself are from left to right...nob: video or ext-audio / nob: Auto Stereo; on or off (mono) / button: MTS / nob: sharpness / nob: brightness / nob: color / nob: hue / button: picture - / button: picture + / button: erase / button: add / nob: Cable; on or off / button: Timer/block / button: TV or Video / button: volume - / button: volume + / button: channel - / button:channel + / button: power