What was found
AIRCRAFT RETURNED TO THE FIELD. CREW REPORTED A LEFT FUEL SCAVENGE EJECTOR CAUTION AND A LEFT FUEL MAIN SCAVENGE CAUTION MESSAGES, FOLLOWED BY A LOW OIL PRESSURE WARNING MESSAGE. OIL PRESSURE WAS FLUCTUATING BETWEEN 25 TO 28 PSI AND WITHIN A MINUTE DROPPED TO 1 PSI WHEN THE CREW SHUT DOWN THE NR 1 ENGINE AND RETURNED TO THE FIELD. MAINTENANCE CHECKED THE ACCESSORY GEARBOX AND FOUND IT FULL OF OIL WITH PIECES OF METAL IN THE OIL. PHX ENGINE TEAM TO TRAVEL TO CAE TO REPLACE THE ACCESSORY GEARBOX AND PART IS MOVING FROM CLT AT THIS TIME. 11/9/04 MAINTENANCE REPLACED THE GEARBOX, OPS AND LEAKED CHECK GOOD.