I just replaced mine for the 2nd time! first one lasted till 80k miles and 12 years , the 2nd (probably a crappy chinese made part from amazon , lasted 60k miles and another 8 years.
its not really that hard to do. after you remove your wheel, you just have to pop out those little clips and some bolts that hold the wheel well cover in place and then you have access to the unit
both times, the white plastic drive ribbon broke in the motor unit and i had to open it up. this time the2 of the screws were completely corroded and i had to drill them out.
funny thing is .. 8 years ago ...after i finished the job... to my shame and horror i had a large spring left over! i saved it all that time and now had a chance ot reunite it with the motor unit . haha... it seems to just take up a bit of tension when the motor starts and stops..i guess it wasnt that critical
