As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON THE GROUND DURING COCKPIT PREP THERE WAS SMOKE IN CABIN AND COCKPIT. TURNED OFF PACKS AND GPU BLEED. WHILE RUNNING THRU CHECKLIST THE AMBER LEFT PACK FAIL ILLUMINATED. TEMP ON ECS SYNOPTIC FOR LEFT PACK SHOWED 115 DEGREES. SYSTEM WORKS FINE WITH R PACK AND GPU BLEED ON. SMOKE OR SMELL WAS NOT ABLE TO BE DUPLICATED. OPS CHECK GOOD. LH PACK ON MEL. IAW AFM