Responded to a report from our customer's alarm company that one of their HVAC units had tripped their alarm. Upon arrival, found the #2 Lennox air conditioner with a tripped breaker due to a grounded compressor and bad contactor. Disconnected the circuit and tested circuits #2 and #3. Found a bad condenser fan motor on circuit #2, and the blower motor not coming on due to a faulty VFD. Requested VFD from provider, will source and quote the other parts ASAP. Confirmed remaining units are functional through EMS.