A new manual override for engine cover door was announced as one of the changes for the 2018 models.
For those new to this, the 2017 models introduced an electric lift mechanism to the engine hatch. Should anything fail in that system, motor, switch, no batteries, well you could not open it which is not ideal. Even when working the door, IMO, raises at a glacial pace. You can depress the open/raise switch and grab yourself a cold one and deploy all of your awnings while you are waiting

. Compare that to the air raise mechanism found on certain Newmar models, which is more far responsive and just feels / sounds better.
Anyway, back to this 2018 change.. We were expecting a new secondary level or latch that would allow one to open the engine bay door like a "normal" engine hatch. Something like the 2015 models. Some pull this pin to disengage the electric lift motors and then a open normally / manually mechanism would take over.
What we have seen is nothing of the sort. What was done is replace two bolts in the lift mechanism with removable clevis pins. So should a failure occur, you just have to
contort yourself reach up behind the engine hatch and
bark your knuckles undo / remove the pin on each side and
hold up with one hand open the door. Once done with your engine / filter / belt / inspection work, you will have to lower the door and replace the pins.
We could be wrong in how this operates, but you know you can't break it until you purchased it

Also the change was just for emergencies, but I really feel the entire system should be re engineered in the near future. I tried to take a couple of pictures so you can see the changes, see the attached.