Color drives/biasing on '77-'80 Zeniths & '74-'75 Sonys...

[fxcamera1]

Hello. Although I've been reading this forum for quite some time. This is my first post. I'm not a qualified technician. But somewhat tech savvy. My question today is regarding color balance(bias)adjustments. In my family we have a history of owning mostly Zenith and Sony color TV sets during the '70s and '80s. In a few of them, especially when they started to get older, the GREEN gun usually falls out of balance and emits more than the other two. Giving a greyscale program a greenish tint. When I was younger I discovered the 3 gun controls either on the back of the Sony cabinets, or on the CRT socket board inside on the Zeniths. Naturally I would think this can be solved by turning the control for the GREEN down a bit. But I have a friend who's father and brother had years of experience tinkering around with Televisions as a hobby, and to me, seemed to possess good knowledge. They advised me that this only fixes the issue TEMPORARILY. They said that the GREEN gun will eventually go back to the level it was at before making that adjustment. They also warned me that it may even get worse if I don't leave it alone, -based on one of their experiences with a 25" Sony Trinitron console set. My sister had the Sony KV-1723 Trinitron from '75/'76, and I still have a Sony KV-1722 Trinitron from '74 and BOTH sets always had the same SLIGHT "green" issue that never SEEMED to change, -I never touched those guns. We also had a 17" Zenith(model?)from 1977 and a 19" Zenith(model?)from 1980. Both those sets didn't seem to have an issue when new, but they both noticably developed a "green" issue to an annoying level as they aged. On these 2, I would turn down the GREEN, but alas the trouble would either return or worsen. After researching online and "youtubing", it seemed that it was fine to make the adjustment, but after seeing one of "shango066's"videos I learned that in some cases a relevant component for that gun going bad might be an issue. So now my Sony 1722 still has a "green" bias, and being that that control is accessible on the back, I'm asking if it is advisable to try to turn it down, or should I leave well enough alone? Thanks :-)