Do you have a relationship with any Rain Bird distributors? I know mine still has a couple of dozen of the panel kit on hand. The kits didn't cost distributors anything, so maybe one can send a kit to you for shipping costs...
It's not the clock panel, but the board attached to the back wall of the box that the modules plug into that is the problem. I had to replace another one 2 months ago. It didn't show the MV Err message, but one of the modules was live all the time. Replacing the back panel fixed it and RB reimbursed my labor to boot (clock was only 6 months old).
Landscaper. Irrigator. Illuminator. Music lover. Coffee drinker.