What was found
HYD 1 LO PRESS ON CLIMB OUT, RAN QRH DID NOT FIX ISSUE, HAD TO TURN PUMP OFF, SHOWED 600 PSI & ZERO FLUID QTY. FLIGHT 5133. REF AML 202066 FOR ED1 R & R, REF AML 2011651 FOR ENGINE DRIVEN PUMP EDP AFTER DRY OPS DUE TO HYDRAULIC FLUID LOSS COMPLIANCE, REF AML 2011616 FOR HYD LINE PRESSURE & CASE DRAIN R & R, & FIX, REF AML 2012068 FOR ED1 OPS CHECK & LEAK CHECK. HYD 1 SYS WITHIN LIMITS & OPS CHKD GOOD IAW AMM 29-10-00. OPS CHECK GOOD, NO LEAKS NOTED, NO MESSAGES NOTED.