As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE HAS REOCCURRING REPORTS OF FAULT MESSAGE 73-31371 BEING SET. INDICATION SYSTEM TROUBLE-SHOOTING HAS BEEN PREVIOUSLY ACCOMPLISHED. PRI: 2 ETOPS SIGNIFICANT SYSTEM EC/TC PWRPL-73CMPT-07267-2. GROUNDED - YES. REPLACED UPPER 11 FUEL NOZZLES PER T/C PWRPL-73-CMPT-07267-2, NO FAULTS NOTED.