What was found
DURING CLIMB, RECEIVED EICAS MESSAGE HYD 1 LOW QTY. FOLLOWED AOM PROCEDURES MONITORED HYD 1 QTY INDICATION. HYD 1 QTY INDICATION BELOW AMBER RANGE AND PRESSURE DROP TO 2900 PSI. AN EMERGENCY WAS DECLARED AND DIVERTED. LANDING WAS UNEVENTFUL AND HYD 1 QTY AND HYD 1 SYS NEVER FAILED. HYD 1 SYS INDICATOR IS IN THE AMBER RANGE WITH NO PRESSURE APPLIED. CREW NOTICED A BURNING ODOR AT THE GATE DURING THE WALK AROUND AND FOUND LEAKING HYD FLUID FROM THE BOTTON OF THE NR 1 ENGINE NACELLE. ACFT REMOVED FROM SERVICE. R & R ENGINE DRIVEN PUMP 1 IAW 29-10-03. OPS AND LEAK CHECKED GOOD. ACFT RETURNED TO SERVICE.