Hi all, so some news for you all..
We livked our 16.49.3 up after xmas, went away for 3 weeks and had this problem happen to us. The day after our holiday we returned it to jayco with a long list of issues, its now over a month fown the track and today we finally picked the van up and they have found a solution, they have used a length of rubber across the top of the lid and when its opened it squashes the rubner forming a seal.. i
Will post photos in the morning, can guarentee you will take your vans back to jayco to get this fix.. time will tell if it works but they tell me they tested it. The reason the van was at jayco for over a month was that they had designed this fix and parts were on bacl order as it was being fitted to all new vans coming off the line