You guessed it David, the regulator is toast. Luckily regulators are plentiful. I'd go with the Ames repop, or wait for them to show up on an eBay auction. I think there are differences with standard and deluxe interior regulators. While you have the panel off, grease the roller tracks and look for broken nylon rollers. I haven't done my doors yet, but I did do my 1/4 windows. Getting some lube in the tracks makes a big difference with ease of operation.
