As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS UNCOMMANDED FUEL TRANSFER / BURN OUT OF #1 WING TANK AT APPROX 200 PPH VERIFIED BY CONSTANT NEED TO ADD LEFT RUDDER TRIM TO COUNTERACT . 500 POUND SPLIT IN LESS THEN 3 HRS. MAINTENANCE REMOVED AND REPLACED LT AFT BOOST PUMP LOW PRESS SWITCH IAW AMM 28-42-11. OPS & LEAK CHECK GOOD.