Norm, can you get up on the roof and pull the cover off? Maybe the fan, or such, came loose and just needs a couple of screws tightened.
Is the AC unit a Dometic?
I don't know the warranty on those units (I would hope it is better than two-years), so it may be worth checking (I assume your coach is around two years old from your signature line).
Dometic may have an authorized service center in your area.
DOMETIC CONTACTS
SALES - Address: 1120 N. Main Street Elkhart, IN 46514 Phone Number: 800-Dometic E-Mail: fdd@dometic.com
TECHNICAL SERVICE - Phone: 800-Dometic E-Mail: techservice@dometic.com
CLAIM PAYMENTS - Phone: 888-867-4188 #7 E-Mail: claimpayments@dometic.com
RETAIL CUSTOMER SUPPORT - E-Mail: customersupportcenter@dometic.com
OEM CUSTOMER SERVICE - E-Mail: customerservice@dometic.com
OEM TECHNICAL SUPPORT - E-Mail: oemtechservice@dometic.com