Re: garage door stuck at open position
I cannot offer specific advice on that opener. Have you tried to contact the manufacturer or the subsidiary that now owns that name/brand?
If the brand is too old to Google, then it's probably at the end of it's useful lifespan and needs replacement. I'm not a big fan of Chamberlain, but they are a big name and a decent brand, Genie is another. Contact a few garage door dealers in your area and see what they recommend. Do a little ****** research of those names and choose from there.
Hope that helps.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!