As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR INTERRUPT, RETURNED, EMER DECLARED, LANDING UNEVENTFUL & ACFT WAS OVERWEIGHT. THE LT ENG BLEED OFF LIGHT ILLUMINATED, BLEED AIR WOULD NOT RESET & ACFT WOULD NOT HOLD PRESSURIZATION ON SINGLE PACK OPERATION. REPLACED THE LT ENG PRESS REGULATING & PRSOV IAW AMM 36-11-09. ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.