Followup on my initial posting above.. I received an electronic installation manual and parts listing for my unit, after submitting a request to Dometic. I also found the parts list and MSRP for parts on this site- www.edometic.com
A lesson learned on removing the AC shroud fasteners is not to use a phillips head tool, but to use a special square shaped tool bit. The rear cover was extremely brittle and started to crack when handled. Was disappointed since we have not had the unit for a year. Local dealership stated that they deteriorate rapidly due to the exposure to the UV rays. A replacement is a little $100.00+ I decided to repaired with JB weld and should be able to get another year use out of them (hopefully). Both units had a slight buildup of dust/dirt on the fins. I blew them out with compressed air followed by a flush. Good to go for another year.