What was found
IRU L LEFT IRU FAILED, PRIMARY POWER INPUT FAILED, SECONDARY (MAIN BAT TERY) POWER FAILED, PRIMARY AND SECONDARY AIR DATA INPUT NOT REC EIVED, UNIT COMPLETELY UNPOWERED OR SWITCHED OFF. FIM TASK REF : 31-90-F8-01A-421B-A CMC MSG# 3420011 FLIGHT STATUS: A INTERMITTENCE CODE: H PH: CLIMB LEFT IRU SENSOR PIC UPDATE. REMOVED AND REPLACED LEFT IRU REFERENCE: DMC-B787-A-34-21-04-00A-720A-A, ALL SOFTWARE INSTALLED AND OPS CK NORMAL AT THIS TIME.