As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - WITH APU OFF ON DESCENT STATUS MSG " APU ISLN VAL". T/S IAW FIM 28-25-00-104 ERASED EICAS MESSAGE AND PERFORMED APU START. NOT ABLE TO DUPLICATE. CLEANED AND SECURED CONNECTOR TO ISOL. VALVE. NO PR'S FOUND. OK FOR CONT SERVICE.