Originally Posted by
BerserkerCatSplat
If the door is connected to a jackshaft opener as you say, I don't see how the door could fall even with an undertensioned spring. Jackshaft openers are worm-gear driven and it should be basically impossible to backdrive one. There should be a double-clamp that connects the opener to the jackshaft, make sure it's tight and and lubricant-free. If he went buck wild with the lubricant he may have gotten it into the clamp and it's slipping on the jackshaft or opener output shaft.