What was found
(CAN) ON CLIMB THROUGH 7,000 FT, ENGINE NR 3 N1 ROLL BACK APPROXIMATELY 10 PERCENT. IGNITION LIGHT WOULD COME ON AND ENGINE RECOVERS. AT 39,000 FT, NR 3 ENGINE N1 ROLL BACK 5 PERCENT. 3 SEPARATE TIMES EACH TIME IGNITION ON AUTOMATICALLY AND ENGINE WOULD RECOVER. FOUND N2 INDICATION TO DEEC IRATIC WITH ALL OTHER PARAMETERS NORMAL. WHEN N2 WOULD FLUCTUATE 5 PERCENT, N1 WOULD ROLL BACK AS WELL. HARNESS REPLACED WITH NEW UNIT. FOUND N2 INDICATION TO DEEC TO BE STABLE NO FURTHER PROBLEMS.