As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK TRIP OFF LIGHT ILLUMINATED AT GATE FOLLOWED BY A HOT SMELL AND WHINNING NOISE <[01]. OK TO CONTINUE PER MEL 21-1-01; SP-1 AUTH# 256726; [02] 01 - REMOVED AND REPLACED PER [AMM 21-51-04-401 CONFIG 1-NG (AIR CYCLE MACHINE (ACM) - REMOVAL/INSTALLATION - PERMANENT)].