As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED CABIN ALT WARNING MESSAGE. FOLLOWED QRH PROCEDURE. SMELL OF SMOKE & LIGHT HAZE IN THE CABIN. FLT 5506 REPLACED NR 1 ACSC IAW AMM. OPERATIONS CHECKED GOOD. PRESSURIZED AIRCRAFT WITH NO FAULTS IN MANUAL MODE. NO HAZE OR SMOKE SMELL DETECTED DURING PRESSURIZATION. SUSPECT HAZE & SMOKE SMELL CAME FROM 02 GENERATORS, PN ON OFF GG690-95028-5, SN ON 00913 & SN OFF 00887A.