200 amp panel box with some circuits not working
Wow! You got some mobile home with a 200 amp service.
The code says:

II. Mobile and Manufactured Homes
550.10 Power Supply.
(A) Feeder. The power supply to the mobile home shall be a feeder assembly consisting of not more than one listed 50-ampere mobile home power-supply cord or a permanently installed feeder.

Maybe you have a modular home?
I agree with BMitch though sounds like you lost a leg on the utility feed. You should call your utility. Might be a tree limb took out one wire of your service.