What was found
HYD SYS A QTY WENT TO ZERO WHEN GEAR RAISED AFTER TAKEOFF. PRESSURE REMAINED STEADY AT 3000 PSI. LOWERED GEAR NORMALLY QTY INDICATION RETURNED TO NORMAL AS GEAR CAME DOWN. GEAR FLAPS & SPOILERS WORKED OK. RAN QRH CK LIST WITH NO AFFECT. RELEASED FOR SERVICE IAW MEL: 29-14, CATEGORY: C EXPIRATION: 26MAR10 "MEL 29-14: A SYS QUANTITY INDICATOR - INOP. CHECK A FLUID QUANTITY PRIOR TO EACH DEPARTURE AND MAKE AN EAML ENTRY. " CHECKED A SYS QUANTITY IAW MEL 29-14. SYSTEM QTY INDICATOR - INOP. CHECK A FLUID QUANTITY PRIOR TO EACH DEPARTURE AND MAKE AN EAML ENTRY. " CHECKED A SYS QTY IAW MEL 29-14. DURING TROUBLESHOOTING NOTICED "A" SYS HYD QTY IN COCKPIT WAS READING OVER A GALLON HIGHER THAN THE DIRECT READING GAUGE ON THE RESERVOIR. R & R SYS "A" FLUID QTY TRANSMITTER IAW AMM 29-33-001-4. ALSO R & R "A" SYS HYD QTY INDICATOR IAW AMM 31-00-011-4. SERVICED HYD IAW AMM 12-12-000-2. CYCLED FLAPS SEVERAL TIMES. "A" SYS QTY INDICATIONS NORMAL AT THIS TIME. ACFT OK TO CONTINUE.