What was found
ON INITIAL CLIMBOUT WHOLE RT SIDE AVIONICS WENT OUT (BOTH EFIS TUBES, NR 2 RADIO, NR 2 FMS). HEARD A POPPING SOUND NORMALY ASSOCIATED WITH WHEN IT TURNS ON AND OFF RADICALLY CYCLING. CHECKED CIRCUIT BREAKERS BUT ALL WERE IN. AFTER 5-6 MINS ALL SYS TURNED BACK ON. PLANE IN HEAVY RAIN DAY BEFORE. POWERED AVIONICS FOR 1 HR 30 MINUTES, NO DISCREPANCY NOTED. CREW STATES THE RT SIDE EFIS TOP & BOTTOM RT RTU & RT FMS LOST POWER. RT RADIO MASTER CONTROLS POWER TO THESE UNITS. REMOVED UNSERVICEABLE RELAY PN MS24166-DN1 SN N/A. INSTALLED A NEW RELAY PN MS24166-D1 SN N/A. OPS CHECK WAS FOUND TO BE SATISFACTORY. ACCOMPLISHED IAW WDM A8-6A-100.