As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 2597 - AFTER TAKEOFF FROM IAH, COCKPIT STARTED TO FILL WITH SMOKE. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED NR 1 ENGINE. AIRCRAFT WAS TEST FLOWN AFTER ENGINE REPLACEMENT WITH NO DISCREPANCIES. AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (REF JIC 72-00-00) AND COEX TEST FLIGHT FORM M-630. ENGINE CHECKED IN SHOP AND FOUND EXCESSIVE OIL IN COMPRESSOR SECTION. (X)