Wax valve issue doesnt apply to your 2006.....two hoses coming from your compressor: 1- high pressure side is a short run to the condenser on the side of the coach--PITA to remove/replace but doable; 2-low pressure side coming from the front of the coach. Nearly impossible to get old hose out of frame rail so need to abandon and replace. Challenges for routing new hose is getting thru the two bulkheads and the narrow space between the fresh water and fuel tanks and the frame rail--but doable.....
IMHO--total replacement of freon in a system is a 9 out of 10 on the DIY scale. To do it "right"-- you need to flush all components, drain oil in compressor, draw/maintain vacuum, add new oil, replace expansion valve and filter/accumulator, ensure both condensor and evaporator are cleaned, and add new freon--insuring good air flow [fan is turning], using gauges, and considering ambient temps....
2003 40' MDTS
Garden Ridge, Texas