NC Fairlane Ghia - power window issues

[Mightyrollaman]

After replacing my rear passenger power window motor and regulator the other day, I was doing a final test-run of all windows from the front, and found that the driver's side rear window didn't want to go down. I feared the worst. However when I tried it from the rear switch, the window went up and down as normal.

So, I assumed it was a fault with the console switch assembly in the front. I removed it, gave it a good cleaning with contact cleaner and carefully sanded the offending contacts with 1200 grade sanpaper. I put it all together and nothing was different. So I thought, the switch must be dead in a way that is unrepairable.

Today I went down to my local Ford spare parts retailer and laid down the $174.80 for a new switch assembly. I then went to the carpark and tested it straight away. No difference.

I then found out the hard way of this retailers refund policy regarding electrical parts (ie they don't do them). Very unhappy.

Anyway, does anyone know where my problem may lie, given that both switches are functional, but the window can only be wound down from the rear. This is of particular concern, as I'm currently trying to sell the vehicle, and would like everything working 100%.