What was found
DURING FLIGHT 3372 NOTED 46 DEGREE DELTA T SHIFT DURING TREND. CREW FOLLOWED ORH AND AVOIDED BOTH 80 - 84 PERCENT NG AND 95 - 98 PERCENT NG FOR REMAINDER OF FLIGHT. AIR RETURN TO MSP. MAINTENANCE FOUND T4.5 TRIMMER AND ITT GAUGE READING INCORRECTLY. REPLACED TRIMMER P/N 4078T09P02, S/N ON GDB02 TIE AND ITT GAUGE P/N 523402, S/N ON 02890005, OPS CHECK GOOD. NEW TREND DATA NEEDS TAPE ACCOMPLISHED USING NEW GPA REF NR 409, 088498 FOR FURTHER DETAILS.