I cut a lot of acres with a 1209 years back. The only problems we had were the reel drive belt slipping and broke a U joint on the gear case to roll drive.
Something else to be aware of is the urethane rolls. I've seen some that had gotten hole(s) in one or both rolls and it seems that the urethane can seperate from the roll...last time I checked new rolls from JD weren't available. Just be sure to turn it through and inspect the rolls carefully.
We would also replace some plastic bushings in ends of the reels from time to time as they would wear and get sloppy.
Good luck and happy hunting!
Tyler in IL