What was found
IRS L DRIFT VERIFY POS FOLLOWED BY 20 DEG PITCH DOWN CA PFD AT FL370. FOUND LT ADIRU FAULT LIGHT ON. PERFORMED BITE PER FIM 34-21 TASK 801. MAIN MSG 34-21002, 34-21037, 34-21003 AND 34-21004 WERE SHOWN. ATTEMPTED REALIGNMENT MULTIPLE TIMES WITH NO SUCCESS. AWAITING PARTS. UNIT, ADIRU, AI OFF 29-3421-9-0010 8992 ON 29-3421-9-0010 7239 UNIT, ADIRU, AI OFF 29-3421-9-0010 8992 ON 0000 REMOVED AND REPLACED NO. 1 ADIRU PER AMM 34-21-01. PERFORMED OPS TEST PER AMM 34-21-00-710-801. OPS TEST OKAY. PARTS USED: 29-3421-9-0010,QTY :1 PARTS USED: 29-3421-9-0010,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1362473 SN OFF 8992