How old is the pump?
W the breaker turned off, open the pump basked and see if he impeller spins freely...if it doesn't, something could be around the shaft - if not, and it spins and it is lopsided, then that's the problem, or as poolguy stated, it's the bearings...
maybe poolguy can answer this, but if you are mechanically inclined, can you pull the motor and take it to a shop that can replace the bearings? If not, you have these options:
1. call jandy and plead your case for a deal on new motor
2. call a jandy authorized company and take to them to fix, and ask for a price ahead of time to diagnose and to fix once identified
3. compare costs and risks to fixing as to getting a Pentair as suggested
good luck, and yes, it's a real pita to buy something new and have it crater like that...sorry