What was found
5 MINUTES AFTER TAKE OFF LAT FUEL IMB.C/W QRH HAD YELLOW NR 3 FUEL QTY LAT FUEL IMBALANCE ALERT EXT LATER FUEL QTY FAULT. C/W QRH. TIP TANK LOW ALERT. C/W QRH AND ALERT EXT TIP TANK LOW ALERT AGAIN, BEGAN QRH THEN GOT TIP TNK TRAPPED ALERT WITH 5700 BELOW ON SD. TURNED ON ALL CROSSFEED VALVES ACCORDING TO QRH. LAT FUEL FUEL IMB ALERT WITH 18000 TANK 1, 8000 TANK 3. BALANCED TANKS BEFORE LANDING. LANDING UNEVENTFUL AT KDEN. T/S NR 3 FUEL QTY SYS AND REPLACED BOTH INNER AND OUTER MJP'S. REPLACED MJP'S PER MD-11 MM 28-41-40-4. LEAKED CHECKED MJP'S. ALL PROBES AND COMPUTERS READ NORMAL FUEL QTY TEST NORMAL. NO TIP TANK TRAPPED WARNINGS OCCURED. SYSTEM OPERATES NORMALLY.