I have a Yale MPB040-EN24T2748, serial B827N15795C. It has a Zapi FC2086a motor controller. the truck has travel, but no lift. the batteries all load test good. there are no codes. the battery indicator lights are flashing and when lift is requested the truck beeps 3 times. I hooked the handset up to the truck and checked everything I could. the motor controller is seeing all the switches. the battery voltage is the same as my volt meter at the battery connector.

Any ideas?