Russ,
I had to replace my pivot shaft on the windshield wiper, so I was able to access and remove the broken shaft from the linkage which connected to the wiper motor on my 2003 Marquis from inside the coach. If your front dash is like mine, you can access the wiper motor by removing the defrost vent covers, then lift up the vinyl dash pad. Then disconnect the flex hoses from the defrost vents. You should be able to remove the padded dashboard and move it out of your way. I had to cut a larger hole in the plywood to get my hands into the area where the motor and wiper assembly were installed which was on the drivers side. I could not access the motor from underneath between the front cap and firewall.
I did not have to remove the motor, just the linkage connecting to the motor shaft. Once you make your way into this area, I don't think it would be too much more work to remove the motor. If you have any questions, give me a call. Good luck!
