if he mentioned the "multifunction switch" yep that would be the culprit and there are a couple things when you swap a multifunction switch you are supposed to take off yours and install in the new one.
1-being the wiper module including the stalk
2-hazard flasher button aka controler.
Problem with that is that your part is broken so he has to order the wiper controler/stalk since those are not made in huge numbers it could take a while.. Bankruptcy on top of a high demand part and a low demand part= annoying wait times..
Not total BS, just annoying BS.. Hope that helps.
Unless he is going to swap the actual motor under the wiper cowl in the engine bay - then just find a junker and pick one up cheap.. Yours being an 06, I can't say for sure its the same for all years, since they did a lot of electrical changes in 06. So if needed look for an 06+ car and pick it out of willing donor.
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The silver 03 GT is gone, but a Solstice has arrived. There are three more PT's to play with though
My personal thanks to veteran and novice crewbies that have offered information and how-to's they have been instrumental in taking LiquidPT from modded car to stock to live a more quiet and sedate life.