I have a Bachmann Plus F7B unit (item #11229) that has a problem with one of the power trucks. The gears seem to be binding up and the unit stalls until I apply a lot of voltage to unbind the gears. Is there a way to repair or replace these trucks? I know this series hasn't been in production for quite a while but was wondering if the new F unit trucks mount in a similar way as the old units or are they a completely different design?

Ron Mele