We got onto the Jayco internet forum, which is excellent, full of good tips and even asked experienced RV friends if they knew of a good way to remove the old sealant without making a big mess and damaging the roof. The plain indication from everyone was, there is no magic way of removing the by Jayco generous applied sealant, a lot of patience and a 2” putty knife were the recommendation.
Benno went up the ladder looking at the exhaust vent and down the ladder again to look at the fridge, he was not thrilled and too happy, I let him have his peace.
below: PC-board with protective cover removed
Use a good ratchet crimping tool, you need red and black AWG 18 or 20 gauge tin copper stranded wire and fully insulated female spade connector, an automotive 12 VDC relay with mounting bracket (Bosch, Hella etc.), a couple of spate double male/female adaptors and a toggle switch (NO) with male spate connector. The two muffin fans should be 12 VDC and 120 x 120 mm in size. Get ball bearing fans and not the sleeve bearing type. Click EBM Papst at the top.