As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STANDY BY POWER SWITCH LOOSE INTERNALLY CAUSING ALL THREE IRS'S TO FAIL . THIS HAPPENED IN FLIGHT ON PREV LEG. REF LOG SHEETS 792866 ITEM 2 AND 792871 ITEM 1 FOUND THAT WIGGLING STNBY PWR CAUSED TROUBLE REPLCD STBY POW PANEL IRUS OPS NML OFF SN ON SN DPN 1 D00812 D00547 311701501