Hi Toby. We had the exact same issue, as have, unfortunately, many people who have had that model of Dometic refrigerator. We were never able to source the upper control panel and ended up having to replace the entire unit with a Norcold. Dometic was not helpful at all with trying to find the part; Oliver Service was very helpful but couldn’t turn up the part. There’s an extensive thread on the forum that talks about this issue. One suggestion was to repair the control panel yourself; that sounded doable but we don’t have the skill set for electronic repair. We had an RV shop replace ours and it was not plug and play. And, we invested in a very nice cooler, Polar brand, similar to a Yeti that allowed us to use the trailer before the refrigerator was finally replaced.
David