As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6502 - JFK-IAD - DURING TAXI, RETURNED TO GATE DUE TO LEFT AIR OFF LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED LEFT FLOW HIGH PRESSURE SWITCH, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)