As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME/ODOR FROM A/C ON GRD, THOUGHT IT WAS TUG DID NOT GO AWAY IN FLT LT PACK RUNS 250 PSI RT PACK RUNS 350 PSI. FOUND LT PACK PUTTING OUT ODOR DISCONNECTED RAM SENSE LINE FROM FLOW CONTROL VALVE LT SIDE. FWD TO MCO/PLACARD PER MEL 21-00-01A.