i can confirm that the model number you posted is not a propane lift model number, it is an electric sitdown counterbalance model lift. All electric counterbalance yale electric sitdown rider lifts start with ERP or ERC.
The yale propane lifts generally start out with GLC or GLP.

However as for the code:
DTC 523780-4 - Park Brake Position OORL

check your park brake sensor circuit and adjustment