What was found
MID FLIGHT NOTICED ABNORMAL FUEL DECREASING. NOTICED UP TO 700 LBS FUEL IMBALANCE. NO TRANSFER OF FUEL FROM TANK TO TANK. NO 1 TANK LOW. PHX PERFORMED COMPARISON CHECK & VERIFIED #1 TANK IS 700 LBS LOW. NEEDS THE BOX HOOKED UP FOR TROUBLESHOTING. AFTER TROUBLESHOOTING PLEASE NOTIFY MX CONTROL TO SET UP TANK DIVE. PERFORMED COMPARISON CHECK (DRIP STICKS) AND FOUND #1 TANK 700 LBS LOW. OK TO CONTINUE PER MEL 28-6-01; SP-1; SP-3; SP-28. FOUND PROBE F7R OUT OF LIMITS. REMOVED AND REPLACED TANK UNIT F1 THRU F12 AND THE COMPENSATOR ON THE L/H WING FQIS IAW AMM 28-41-21. OPS CHECK AND LEAK CHECK GOOD.