What was found
ON TAKEOFF, NR 1 ENGINE ADVANCED TO 40 PERCENT N1 AND WOULD NOT GO BEYOND, ALL OTHER PARAMETERS NORMAL. ENTERED ON DMI NR19537 AS PER MEL 77-11-1 CAT "B" REFER TO DDG 77-1 C/W. PERFORMED NR 1 ENGINE RUN-UP IN ACCORDANCE WITH M/M 71-00-00. FOUND N1 INDICATION OPERATING WITHIN LIMITS IN ACCORDANCE WITH M/M 77-11-01. COULD NOT DUPLICATE FAILURE. ALL OTHER PARAMETERS NORMAL. CLEARED DMI 19535 - LOG PAGE 115870.