I noticed a problem with opening the Fantastic Vent Fan (Dometic) lid the day we brought our new Lance camper home last winter. But I forgot about it until we used the camper for the first time last week.
The lid would open about 1/3 and then the handle became hard to turn to the point of locking up. I could stick a small wire thru the screen and push the lid up a little and then I could turn the handle until it was fully open.
I sent Dometic an email and got a quick next-day response from Shelley. I told her I had already taken it apart and the lift arm mechanism gears were binding up. She said she would get a warranty replacement part headed my way today.
A lot of manufactures are very slow to answer email and just provide canned answers when they do. That was NOT the case here. Dometic was very responsive and helpful.
bradw