What was found
GROUND POWER DROPPED OFF THE AIRCRAFT. AFTER POWER WAS RESTORED THE COCKPIT SCREENS WOULD NOT COME ON AND THE GRND WARNING HORN GOES OFF WHEN ALIGNING ADIRU'S NR 1 AND NR 3. UPPER ECAM 'BCL2' FAULT DISPLAYED, BUT BCL2 TESTS OKAY. REPLACED BCL2, NO HELP WITH ORG PROBLEM. ECAM FAULT CLEARED. REPLACED SHIP BAT2 PER AMM, NO HELP. ADIRU1-3 CAUSE CREW HORN AND 'ON BAT' LIGHT ON ADIRU'S CDU. FOUND ADIRU NR 1 AND ADIRU NR 3 WITH FAULTS. REPLACED BOTH ADIRU(S) - AIRCRAFT SYSTEMS NOW OPS CHECK GOOD. NO ECAM FAILURE MESSAGES NOTED.