I don't know what type of engine or track help you are looking for, but my guess is that if you need tracks your best bet will be to build a new set of tracks for the machine from belting. I've got a copy of the original factory brochure, and the specs on the Ridge Runners are pretty impressive. The PSI is amazingly low at 0.32 pounds, that is less ground pressure than an Aktiv Snow Master.
Can you be more specific in what help you need? Maybe someone here can help you out. Pictures often help people sort out problems so if you have a digital camera, posting some shots of your problem areas may help someone help you.