What was found
PDIS 664 29-10 0858 02OCT18 OAK FACT U LOGPAGES:2943168 CRUISE AT FL 320, YELLOW HYD PUMP PRESSURE LOW DUE TO NO HYDRAULIC FLUID IN THE YELLOW SYSTEM, CONFIRMED ON GAUGES. SHGN 03OCT18 00:33 OAK U FOUND FLUID DRIPPING OUT OF RT GEAR WELL AT BLOCK IN. FOUND FLUID RUNNING DOWN YELLOW SYS MANIFOLD & OUT OF THE BASE OF THE YELLOW SYS LOW PRESSURE SW (31WW). REMOVED SWITCH 31WW PER MM 29-13-12-04 & FOUND NO O-RING INSTALLED. INSTALLED NEW SWITCH & PACKING. REQUIRES LK & OPS CK'S. **NOTE** HYD FLUID WAS STEADILY FLOWING OUT OF MANIFOLD WHEN SWITCH REMOVED, DID NOT HAVE A COMPLETE LOSS OF YELLOW HYD SYS. FACT 03OCT18 04:34 OAK U LEAK CHECK PERFORMED PER AMM 29-00-00-06 WITH YELLOW HYD PUMP AND NR 2 ENG RUN (RAN PER JRH), NO LEAKS NOTED, OK FOR SERVICE.