Furnace model Rheem RGFD-09EZCMB (installed 2001)

2010 - noticed code "66" flashing intermittently
- furnace seemed to work OK even with his code

July 2013 - noticed code "68"
- noticed burning smell in ducts while A/C running.
- furnace fan still running
- turned off A/C
- turned on A/C, noticed code "67"
- fan would not turn on.

Motor is:
Rheem p/n: 51-242690-03 CCW

Is this a bad motor problem or other problem (capacitor, circuit board, etc)