What was found
HYD SYSTEM "A" QTY DROPPING INFLIGHT--CREW STATED 71 PERCENT AND DROPPING - AIR RETURN TO IAH PERFORMED DEU 1&2 BITE CHK PER AMM 31-62-21-860-003. DEU1&2 PASSED TEST. TRANSMITTER, HY OFF 29-2909-9-9001 1625 ON 29-2909-9-9001 5456 TRANSMITTER, HY OFF 29-2909-9-9001 1625 ON 0000 REMOVED AND REPLACED HYDRAULIC FLUID QUANTITY TRANSMITTER/INDICATOR REF AMM 29-33-12. OPS CHECK GOOD. NO LEAKS DETECTED PARTS USED: 00-0585-3-0372,QTY :1 29-2909-9-9001,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1552301 SN OFF 1625.