What was found
(CAN) UNIT WAS REPAIRED AND TESTED AT IFR PRECISION INSTRUMENTS (EDM.AB) AND RELEASED SERVICEABLE ON APRIL 3, 1997. UNIT IN STARS STORES IN THE MEANTIME. WHEN INSTALLED IT LASTED 21 HOURS BEFORE THE SAME FAULT OCCURRED: NR 1 ENGINE N2 INDICATOR NEEDLE WOULD DROP OFF SUDDENLY AND TEMPORARY. THIS SAME INSTRUMENT WAS HAVING THE SAME PROBLEM IN C-FIOM BEFORE REPAIR AND PILOTS RECOGNIZED THIS WAS AN INDICATION PROBLEM.