Small update:
It looks like I found the reason why my roof lowered wonky. The emergency hydraulic pressure reliever for emergency roof lowering wasn't as tight as it had to be.
I tightened the screw, and now the roof closes even again. Now I can't "shake" the roof anymore, pushing the oil from the left side to the right and back.
I haven't had the time to test the roof's ability to stay up for more than 24 hours without having the need to pump the roof up again, but I have full confidence that it will be alright now.