Retracting side mirrors

[TJ]

Not too long after getting my H2, the side mirrors stopped retracting/extending properly. I took it into the dealer and they "performed mirror re-timing sequence and cycled mirrors to reset timing". Then yesterday, when trying to retract the mirrors, the driver's side mirror started, went about 1/4 the way, but then stopped (passenger side mirror still working okay). It will go all the way back out, but when trying to retract won't go any further than about 1/4.

Does anyone know if this "re-timing sequence" can be done by me or does this sound like another trip back to the dealer?