As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, ON DESCENT LEFT ENG BLEED LIGHT ILLUMINATED AND L ENG PRV EICAS MSG ILLUMINATED. TURNED OFF LEFT ENG BLEED AIR SWITCH AND LEFT PACK CONTROL SELECTOR. PERFORMED TEST PER FIM 36-10-00 FIG 123. OPS CK'S NORMAL. NO FAULTS. NO MSG'S.