My drivers side wiper is moving slower than my passenger side on my 2010 wrx sedan. This happened after a bad ice storm and I worry i damaged the motor after trying to use the winshield wipers. They still work but because the passenger side moves faster than the driver, the driver side does not go through full rotation as it get blocked by the passenger wiper. When I try to rotate the driver side wiper by hand with the wipers off it moves freely, whereas the passenger side does not. Should I replace the whole assembly or is it a matter of torquing the right part on the driver side? Any help would be really appreciated.