What was found
FLIGHT 2116. APU IS LEAKING OIL RAMP REPORTED SMOKE FROM APU. REMOVED FROM SERVICE AND PLACED ON MEL 49-00-00. RETURNED TO SERVICE. MEL CLEARED 6/26 BY PERFORMING APU OIL SYS INSP IAW AMM 49-90-00-200-801-A, FOUND NO LEAKS. RAN APU, COULD NOT REPLICATE DEFECT. UPON GVI OF ACFT TAIL, FOUND TRAIL OF HYD FLUID COMING FROM BELLY OF ACFT. SUSPECT RESIDUE & SMOKE IS FROM HYD FLUID IAW AML 1152720, NR 1 HYD QTY IS LOW IN CRUISE. NFDN. PLACARDS PULLED, MX PROCEDURES REVERSED. CLEARS MEL. REMOVED HYD SYS 1 ACCESS PANEL 195DL & FOUND ECOLOGY BOTTLE FULL, DRAINED HYD SYS 1 ECOLOGY BOTTLE IAW AMM 12-12-11-600-801-A. CLEANED AREA AROUND HYD SYS 1 AS REQ & PERFORMED LEAK CHK. NO OBVISIOUS LEAKS NOTED. SERVICED HYD SYS 1 TO LIMITS IAW AMM 12-12-01-600-801-A. RAN BOTH ENGS & ACTUATED ALL FLT CONTROLS. NO LEAKS FOUND. HYD SYS 1 QTY REMAINED STEADY. REINSTALLED HYD SYS 1 ACCESS PANEL 195DL AS REQ. NFDN. ACFT OK FOR SERVICE.