What was found
NO TAKEOFF AND MASTER WARNING CAME ON DURING TAKEOFF ROLL. DU NR 2 SHOWS FUEL QUALITY LOW, ABORTED TAKEOFF. FOUND FUEL QTY LOW LEVEL LT ILLUMINATED UP TO 630 LBS, SHOULD EXTINGUISH AT 500. DEFUELED ACFT AND GAINED ACCESS TO LOW LEVEL SWITCH OHMED OUT SWITCH AT PIN X. FOUND RESISTANCE READING WHEN SIMULATING FUEL LEVEL, 3352, SHOULD BE OPEN. REMOVED AND REPLACED LT LOW LEVEL FUEL SWITCH WITH NEW PER 750 M/M, CH 28-20-07. FUEL ACFT TO DUPLICATE SQK. SEALED SWITCH & BUILT UP WIRES W/ PINS. REMOVED LT BATTERY TO RESTORE CONNECTION PY011. RESTORED BATTERY. SWITCH OPS CHECKS GOOD BY MANUALLY OPERATING FLOAT SWITCH. MAINT PERFORMED IAW 750 M/M CH 28-20-07.