What was found
CREW REPORTED LEFT HYD QTY BEGAN TO DECREASE AFTER ENGINE START. SUPPLEMENTAL DATA UPDATE AFTER SERVICING L HYD SYSTEM, ACCOMPLISHED ENG RUN PER JRH 2-6-1, EXERCISED ALL FLT CONTROLS SEVERAL TIMES,CHECKED CENTER RUDDER PCA, UNABLE TO FIND HYD LEAK. FOUND LT YAW DAMPER HYD LINE B-NUT CONNECTION HAS 1 DROP PER MIN, REF IPC 22-21-03-01A ITEM 110 &125 FOR SUSPECTED AREA. CHK'D FOR HYD LEAK PER MM 29-00-98 OK. YAW DAMPER LEAK WITHIN LIMITS PER MM 29-00-99 PAGE 601. PERFORMED INSPECTION ON WHEEL WELL AND TAIL SECTION. NO LEAK NOTED, NO HYD SERVICE. HYD READ 97% KEEP OPEN FOR MORE EVALUATION. AT THIS TIME FOUND NO OBVIOUS LEAKS HYD QTY READS 97%.