There are a few things that you could look at, but you should be aware that the A/C unit is covered by a 3 year manufacturer warranty and if you so much as remove the shroud, you could be voiding that warranty! Plus you have a 2 year Airstream factory warranty as well. My first thought would be the capacitors in the upper control box.
I would pursue those avenues first, and if you don't have any success there, let me know and we can troubleshoot it!
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
MASTER TECH ENERGY SYSTEMS, INC.
AM SOLAR ...MAGNUM…VICTRON ENERGY...LITHIUM & LIFELINE BATTERIES…MARINE REFRIGERATION