What was found
ON CLIMBOUT DEPARTURE CONTROL INFORMED US THAT TOWER SAID WE WERE EMITTING BLACK SMOKE OUT OF NR 1 ENGINE. ALL ENGINE PARAMETERS INDICATED NORMAL. ELECTED TO MAKE A PRECAUTIONARY LANDING. PER CREW DEBRIEF- CAPT REPORTED ALL NORMAL INDICATIONS, ON INBND LEG TO LAX TOWER REPORTED NO BLACK SMOKE NOTED, FLIR IMAGING ALSO WAS USED ON FINAL APPROACH BY LAX OPERATION DEPT, WITH NO UNUSUAL HEAT PATTERNS OR FLARE UPS NOTED. INSPECTED ENG - FOUND HYD LEAK AT BLUE SYS MANIFOLD, REPLACED FILTER BOWL AND FILTER - RAN ENG WITH NO EVIDENCE OF SMOKE AMM 29-11-36-3 & JRH CHAP 5-6