As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 494 - MID-MEX - AIRCRAFT RETURN TO GATE, HYDRAULIC LEAK AT LEFT COMPARTMENT RESERVOIR AND DURING ENGINES STARTING THE 'LIGHT RUDDER PCU' EICAS STATUS MESSAGE TURN ON. THE LEFT SLATS BYPASS VALVE WAS REPLACED IAW MM, TASK CARD 27-81-09-024-001 AND 27-81-09-424-016) FIM PROCEDURE WAS ACCOMPLISHED AND MESSAGE WAS ERASED IW FIM 31-4-00. THE SLATS SYTEM WAS CHECKED IAW MM 27-80-01, ALL TESTS CORRECT. (M)