What was found
ON CLIMB, BOTH ATT LIGHTS (WARNING) ILLUMINATED WITH CAPTS ADI FROZEN, W/ATT FLAG IN VIEW, ACCOMPLISHED CK LIST PROCEDURES. SWITCHING TO ALT, NO HELP. NR 1 INS FAILED WITH WARNING LIGHT AND BLACK SCREEN. NR 3 INS DISPLAYED A WARNING LIGHT WITH ERRONEOUS G/S INDICATION AND ATTITUDE INDICATION ACTION. CODE REMOVE INU NO MALF CODE. HEAVY WEIGHT LANDING LDW 344.6KGS. REMOVED AND REPLACED NR 1 INU PER AMM 34-41-03. ALIGNMENT CHK PERFORMED SATIS. REMOVED AND REPLACED NR 3 INU PER AMM 34-41-03. ALIGNMENT CK PERFORMED SATIS. ACCOMPLISHED OVERWEIGHT LDG CONDITIONAL INS PER 5-51-39, STEP 2A (PHASE 1) NIL DAMAGE NOTED, A/C OK FOR SVC.