As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD - FLT 1097 - DURING TAKEOFF, EN ROUTE DCA-ORD, AIRCRAFT STARTED TO FILL WITH SMOKE. DIVERTED AND LANDED IAD WITHOUT INCIDENT. ACCOMPLISHED PACK BURNOUT OF RESIDUAL HYDRAULIC OIL THAT LEAKED FROM RIGHT PRESURE REGULATOR VALVE THE PREVIOUS DAY. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)