Do not do a force download 5-7-2 you will cause more problems. You need to check if you have the right G01 or G11 number on the COB24 board that your replacing. Then you need to do a LON download 5-7-1. Also is the lift staying on fire service? what are the car buttons doing? how many COPs do you have? If you have 2 COPs it could be either COB24 board or even a CEB extension board.