1-25 points I don't know the formula but I received the max amount because I currently ( not the first owner) own a early 2002-2003 model 1200lrim .. the prime candidate and was able to provide the serial number. While I have done some things to improve airflow I didn't provide any other receipts or proof. The bad thing is I think all the RV places that are good at changing out and modifying the cabinet to fit a residential will now be booked up as some will now find comfort that a large part of the switch out will now be paid for. Having it done costs 2000-3000 bucks depending on how much of the cabinetry need modified and of course which residential you choose and if you need to modify electrical ( more batteries and pure sine wave inverter ) it can get much more expensive.