It’s not that hard , I have done it twice cause I screwed up the first time. Get a rubber football and when you remove the exhaust you will get a slow flow of water coming in from hull exhaust , shove the football into the rubber boot that the exhaust pipe was connected to and that will stop the...
With a house in AZ and the hard water there you probably have a water softener and copper pipes. If so it is a very good practice to turn off your house water when your not there since water softeners remove minerals and the water will try and make itself whole again and will attack the copper pipes
I had the same problem with the Samsung in my motor home and I removed the back of the TV and a number of the capacitors on the control board had black specks which were signs of leakage so I bought new capacitors online and replaced them and all good