What was found
EMERGENCY LANDING - FLT 113 - DURING DESCENT, CREW NOTICED NOISE COMING FROM PTU. DESELECTED PTU AND RECEIVED HYD Y ENG PUMP LO PR MSG. MADE EMERGENCY LANDING IN LAX, LANDED WITHOUT FURTHER EVENT. TAXIED TO THE GATE. MX TROUBLESHOT AND TESTED THE YELLOW ENGINE DRIVEN PUMP, NR 2 ENGINE, IAW AIRBUS 319/320 TSM 29-13-00-710-002. ALSO, TROUBLESHOOT AND TESTED YELLOW HYD PSI SWITCH IAW AIRBUS 319/320 TSM 27-97-00-810-828A. COULD NOT DUPLICATED DISCREPANCY AND NO FAULTS WERE FOUND.