As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RAN APU FOR 10 HRS FROM MADRID. AFTER LANDING SELECTED APU BLEED TO OPERATE BOTH PACKS. CABIN FILLED WITH THIN HAZE AND FLT ATT REPORT ELECTRICAL ODOR. RAN APU PNEU SYS, RAN BOTH PACKS WITH AND WITHOUT RECIRC FAN AND NO HAZE OR ODORS FOUND. APU PNEU SYS, OPS OK.