I have a multi meter and my only limit would be if I needed to change the hot gas valve as I cannot evacuate the system.
Sorry Phil, I cannot issue a positive rating, this is not a complex machine. That you present it as such tells me that while you have a engineering degree you are not a in the field service tek. Most repair personnel have a vocational training in hvac at best and service these machines all day long. No harm in dropping this ticket.