Recently somebody knocked off the cover of my passenger side wing mirror (or stole as confusingly it wasnt anywhere to be seen). Since then the passenger window only goes down half way, as if its gotten stuck. At first i assumed somebody had actually hit my door as i was parked in a public car park at the time but theres no damage at all to the door, no dents, no scratches, nothing. Have the electrics somehow been damaged when the mirror was hit?

Does it not go down even if you keep holding the button?

No it just stops dead as if its stuck

have you had mirror assy off at all, or just put cover back on?

The indicator bulb was hanging out of its mount so i pushed that back in but aside from that i only got a new cover and put that on.

Stretching it,  but have you contacted your local cop shop? Might be someone bumped you, cover flew off and they took it away save it getting nicked / broken, if there were witnesses it may have been reported in

Unfortunately its too late, happened a few months ago and its only now im trying to sell the car that i thought about getting it fixed

You need to take the door panel off and get a good look inside to see what's causing the glass to jam.