Where are ya at? Put it this way if I knew where they were Id buy it just to have a spare. About the only way to truly tell is to pull it apart but that probobly isnt an option here. Id drain the oil and lood for shiny bits of metal, once drained Id run it through the gears and check for slop, noises etc. Im sure Marlin will chime in on this one and tell ya WAY better than I ever could but thatll get ya started.
WT