What was found
AIR TURNBACK (ATB) IN CLIMB BETWEEN 10,000 + 11,000 THERE WERE TWO (2) SEPARATE POWER INTERRUPTIONS, EACH LASTING 2-3 SECONDS, RESULTING IN MOMENTARILY LOSS OF ALL DU'S + VHFS. PERFORMED BITE OF EPCU PER AMM 24-21-02. NO FAULTS. RESET VIA 1+2. PERFORMED VIA 1+2 RTS PER AMM 31-43-00. NO FAULTS. PERFORMED BITE OF VHF 1,2,3. NO FAULTS. INTERMITTENT FAULT. OK FOR SVC. VHF BITE PER AFIM 23-12 TASK 801.