I would b!tch to the local/regional Rainbird rep about it. Even if it gets you some free schwag. I went to lunch with my Ewing manager, and the RB rep last year. Told him all my issues from the bad DV solenoid o-rings, the failures of the 3500, the MV Err issue with older ESPm controllers, the old T-Bird failures, and the DVs that slam shut and cause issues in high pressure situations. I received a good size credit at Ewing, and a tackle box of nozzles and RB rotator nozzles, all courtesy of RB. Now, I can't say they will do that for you, but it doesn't hurt to try. And if they don't impress you, move on to another manufacturer.
RB used to pay me good money to replace the TBirds.