As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 2024 - DCA-BOS - EMERGENCY LANDING - NOTICED ENGINE NR 1 LOSING OIL QUANTITY. DECLARED EMERGENCY LANDING. REMOVED AND REPLACED ENGINE NR 1 PER JOBCARD 26L40071001. WILL FURNISH ROOT CAUSE INFORMATION UPON RECEIPT OF TEARDOWN REPORT.