As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TUL FLT 9668 EN-ROUTE TUL - TUL. THE AIRCRAFT WAS GROUNDED. DURING DESCENT BELOW 15,000 THROTTLES AT IDLE LEFT ENG PRV STATUS MSG DISPLAYED WITH ASSOCIATED EICAS AMBER MSG DURING DESCENT BELOW 15,000 THROTTLES AT IDLE LEFT ENG PRV STATUS MSG DISPLAYED WITH ASSOCIATED EICAS AMBER MSG. MAINTENANCE REMOVED AND REPLACED PRV. PERFORMED L/H INSTALLATION TEST CHECKED NORMAL, LEAK CHECKED GOOD IAW AMM 36-11-19. OPS CHECKED NORMAL WITH NO PRV STATUS MSG DISPLAYED IAW AMM 36-11-19.