Richard my dad(Russ Eyres ) and I have two pm52's and two more dos style pm51's that no longer work . Our PM52 worked untill nov El Mirage ,05 We were able to get hold of Don at707)223-1663, and sent the unit to him. Do to health some healthissues and his supplier going out of busness, there's not much he can repair on these units. Mine worked great untill it didn't work at all, we miss the run to run info greatly. Try and give Don a call, Ibelive he is the north bay/San Fransisco area.I would certainly like to find a equally priced replacment. Hope this helps. Eric Eyres