Very strange.
O/S mirror occasionally folds. Near side works fine. Quite happy to manually fold mirror but after about 3 weeks of doing this I noticed the mirror folded as normal (it hadn't moved electrically for days) then when I opened the mirrors it only opened about 50% of the way so the locked position is now not open enough to see behind me. I bought a new complete mirror. It has done exactly the same. The nearside is faultless. Please help