What was found
PDIS 740 29-11 5444 01MAR21 ANC OPEN U LOGPAGES:3142187 UPON TAKEOFF YELLOW HYD PRESSURE DROPPED TO 0 PSI FOR APPROX 30 SEC WITH CORRESPONDING LOW HYD PRESS ECAM, PRESSURE THEN RETURNED TO 3050 PSI. THIS HAPPENED 3 SEPERATE TIMES WITHIN A 2 MIN WINDOW. RETURNED TO PANC, NO EMERGENCY DECLARED. FACT 02MAR21 01:18 ANC U FOUND #2 ENGINE YELLOW SYSTEM HYD EDP DEPRESSURIZATION CANNON PLUG LOOSE. R&RED #2 ENGINE YELLOW HYD EDP PER MOCC REQUEST REF AMM 29-11-32-04-01. SERVICED AND BLED YELLOW SYSTEM INCLUDING CYCLING OF CARGO DOORS. REF AMM 29-00-00-04. RAN #2 ENGINE REF A300 JRH, PERFORMED OPERATIONAL TEST REF AMM 29-10-00-05. SELECTED YELLOW PUMP ON AND OFF NUMBEROUS TIMES. OPS CHECK GOOD.