On my 93 Bronco (full size), if I press the power lock button inside and then try to unlock the door with the key from the outside, it won't even turn. Something gets the mechanism in a bind. I sprayed the mechanism with wd-40..that didnt work...so I sprayed brake cleaner to get rid of all the dirt and grime in there....cleaned it up some. I then greased everything with white lithium grease and it didn't make a difference. Any suggestions? Or should I just plan on replacing the lock a$$embly??