As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L BL AIR FAIL LIGHT 1 HR INTO FLIGHT. LIGHT RESET WITH PNEU/ENV OFF. ILLUMINATED 30" LATER. RESET WITH PNEU/ENV OFF. NEVER ILLUMINATED AGAIN FOR .8 FLIGHT TIME. DISCREPANCY CLEARED WITH THE REPLACEMENT OF LEFT HAND BLEED AIR PRESSURE SWITCH