What was found
NR 1 ENG MOMENTARY EPR-EGT DROP. IAW CREW THE DROP OCCURS AT FL270 275 KNOTS SAT -45. ENG PARAMETERS ARE NOW STABLE IN CRUISE. CREW CONFIRMS A SLIGHT MOMENTARY YAW WHILE ENGINE RECOVERED. A-T ON, A-P 2 ON. ACFT EXPERIENCING MODERATE TURBULENCE AT THE TIME. DROP WAS MOMENTARY AND RECOVERED IMMEDIATELY. FLEW ON AP1 & AP2 AUTOTHROTTLE ON & OFF, EPR IN NUMEROUS POSITIONS NO LOSS OF POWER. TRIED DIFFERENT SPEEDS AND ANGLES OF FLT. NO FAULTS NOTED.