I took my 86 Mustang to a body shop today to get an estimate on them fixing my windows. They bind badly when going up and down (electric) and sometimes I have to persuade them to come up. I took the panel off and they need help. The shop said it would be best to just replace the doors instead of him going inside to fix the problems. Any advice or suggestions, the area inside the door is tight. I don't think it would be a fun job for me to tackle myself. Help