What was found
MDIS 525 29-02 7176 22SEP19 MEM FACT U LOGPAGES:3146933 FLYING AT FL33, LEVEL ONE "HYD 1 OFF" 44 MINS LATER LEVEL 2 "HYD 1 FAIL" FACT 23SEP19 01:03 MEM U AMM: 29-11-20-4-1 REMOVED AND REPLACED #1 ENGINE LEFT AND RIGHT EDP. REPLACED #1 ENGINE HYD CASE DRAIN FILTERS. OPS CHECK AND LEAK CHECK GOOD REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: 350880-6 POS: 102 SRL: MX-551274 TAG NR: F58152 ON MPN: 3031863-001 CPN: 2900019 SRL: MX798201 TAG NR: 8127G1 REASON CODE : FAILED OPS CK & REPLACED WITH SERVICABLE UNIT OFF MPN: 350880-6 POS: 101 SRL: MX620570 TAG NR: 45F457 TAG NR: G80145 ON MPN: 3031863-001 CPN: 2900019 SRL: MX824100 TAG NR: 862G89 REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: 350880-6 POS: 101 SRL: MX620570 TAG NR: 45F457 TAG NR: G80145 ON MPN: 3031863-001 CPN: 2900019 SRL: MX798736 TAG NR: F52136.