As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, LEFT DUCT PRESSURE NOTED AT 55 PSI. RIGHT INDICATED NORMAL PRESSURE AT 35. NO EICAS MESSAGE WAS DISPLAYED. PRESSURE NORMALIZED DURING CRUISE FLIGHT. AIR SUPPLY BITE PROCEDURE C/O IAW FIM 36-20 WITH NO FAULT NOTED, AS WELL AS ENGINE GROUND RUN C/O SERVICEABLE.