As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LP481863 ITEM 1ENGINE #1 STALL ENROUTE TWICE AT FL 370, NO ABNORMAL ENGINE PARAMETERS OBSERVED. THIS AIRCRAFT WAS GROUNDED AS A RESULT OF THIS DEFECT. LP481863 ITEM 1. IAW TSM 77-11-00-810-815-A, REMOVED AND REPLACED IP CHECK VALVE IAW AMM TASK 36-11-41-200-803. TW 0899402638 DD 03/06/25. AC OK FOR SERVICE.