MRs equipment is not that bad.
Usually look for burnt spots on the relays.
Most of the problems are the relays in the back for the doors.
Hopefully it has the electronic stepper board instead of the original stepper switch.
Check the limit switches in the hoistway to make sure they are not those that turn to goo.
Occasionally you will have a sensor on the car top go bad.
And the switches on the door operator.That is if you have the 7300 door operator.