Air Conditioning Shrouds

[Mariner]

Hi All,

I would like to get to sealing around where the air conditioning sits on the roof. I have removed the cover inside and can see no signs of water leaks. The hole in the roof is visible along with the seal (with the help of a mirror and flashlight).

What I would like to do is remove the shroud or cover on the outside of the air conditioner. I have a Coleman Delta T unit, but do not have the manual for it.
I can see that the top half of the cover can be removed easily enough. My question is, can the lower half of the plastic/fibre glass shroud be removed without having to take the complete A/C unit out of the trailer? If this lower half can be removed, then that would make things much easier for cleaning up the roof and sealing where needed.

Any help that you experienced people could send my way, would be very much appreciated.

Thanks in advance,

Mariner