As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AND DESCENT, L DUCT INTERMITTENTLY ZERO. ACCOMPANIED W/ L PACK OFF EICAS L ENG BLD OFF EICAS.(<P>LOG PAGE 1196915: REMOVED AND REPLACED L/H PRSOV IAW AMM 36-11-09, OPS AND LEAK CHECK GOOD. NO DEFECTS NOTED AT THIS TIME. <BR /></P>)