It may be difficult in your case to change it out, but there should be a better way. Are you sure you can't get to it from the top or other side of the wall? Maybe the wall has a small section that can be removed to get to it. I'm on my second PA, and I could/can get to both of ours. Water pumps are replaceable items, there has to be a easier way to replace. Just maybe in your case, the design was not considerated for an easy access. Good Luck...........
2003 Pace Arrow 34W, F-53 V-10 22,000#, 5-Star, Avg 7.7 MPG, ScanGauge II, 540 Watt Solar
WiFiRanger Elite Pack, WeBoost 4G-X, Voltage Booster, Progressive Industries EMS
Water Softener, Safe-T-Plus, Koni, Centramatic Balancers, CHF, Rear Trac Bar, EEZ TPMS