As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START EICAS MSG LH ENG BLEED OFF, FOLLOWED QRH PROCEDURE AND COMPLETED ON GROUND (DUCT PRESS IND. ZERO) - REPEAT WRITE UP.(<P>AFTER FURTHER INVESTIGATION FOUND SUPPLY PRESSURE HOSE LOOSE ON PRV VALVE. TIGHTENED LINE AND PERFORMED ENG RUN. PNEUMATICS OPERATING NORMAL AT THIS TIME IAW AMM 36-11-18.</P>)