Don,
Your motor will need to be replaced or repaired. The pump should be fine. If you can, drain the system and remove the reservoir. Take it a part and remove the motor. Most places that repair alternators, starters and the such will be able to re-build your motor. I had the same exact problem, but chose to replace the motor. Problem is that the manufacturer of my MH chose to put the Power gear system behind my grill so that all the******from the road beats it up. My motor was toast from road grim so when I put everything back together I decided to seal EVERYTHING with a high temp silicon. This way nothing was going to get into the motor again....
Good Luck....