What was found
DURING CLIMB, CREW REPORTED "A" SYSTEM HYD QTY IND DROPPED, CREW SUSPECTED AN "A" SYSTEM HYD FLUID LEAK. A/C RETURNED BACK TO MIA AND LANDED W/O ANY FURTHER INCIDENT. MX TROUBLESHOT "A" SYSTEM HYD LEAK, A LEAKING HYD LINE FOUND AT "B" NUT CONNECTION TO "A" SYSTEM HYD MODULE, HYD SUPPLY LINE R/R`D IAW B-727 MM CH-20-10-05. HYD SYSTEM WAS SERVICED IAW B-727 MM CH 12-12-0, AN OPS & LEAK CHECK PERFORMED IAW B-727 MM CH 29-11-61. ALL CHECKED OUT NORMAL. AN INSPECTION AND REPLACEMENT OF "A" SYSTEM PRESSURE AND CASE DRAIN FILTERS ACCOMP FOR CONTAMINATION, NO DISCREPANCIES NOTED, WORK ACCOMP IAW B-727 MM CH 29-11-0 AND LEAK CHECK GOOD IAW B-727 MM CH 29-11-41. A WATCH ITEM WAS INITIATED TO REINSPECT "A" SYSTEM CASE