the symptoms were slow operation, sluggish towards the top of closing, sometimes binding , and when winding down it would drop at two thirds down , ( but not all the way )
this is not acceptable , i had spare motors on the frames from the spare doors from the restoration , but they were the earlier round Delco motors compared to the square sided ( Seimens ? ) motors for my 89 car , however, after a quick test on a battery i found they work exactly the same, and the wiring is interchangeable , as its just Lucas bullet lugs
the main problem is the complete dismantling of all the door components to get in there and work on it, but its embarrassing ( and wet )
when the window wont work, lol so had to be done 
i wound the window all the way to the top , and then removed the door card , then i undid the motor mounting plate screws , along with the door lock handle , this allows the whole part to be wiggled out while sliding the runner out of the bottom of the window glass runner , and then install the replacement , putting all the screws in finger tight and getting things lined up before tightening , then i started smiling, as this motor and gear works perfectly ,
while it was all apart i had a go at the electric mirror controls, these are notorious for not working, examining the small pin plugs i noticed the male pin sections were ' split ' allowing me to insert a stanly blade and pry the two sections apart making the pin wider, i did this to every pin on all the connectors, this allows a tight fit back to the female plug and hey pesto , fully working electrically adjusted mirrors,
thats a first, lol
BB
