As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ON FLIGHT 3026 ON CLIMBOUT IN ICING CONDITIONS THE RT AIR VALVE LIGHT ILLUMINATED. AIR RETURN TO MSP. MAINTENANCE FOUND OIL IN CANNON PLUG W3P7. CLEANED CANNON PLUG, PERFORMED OPS CHECKS IAW GE MM APPENDIX 7. OPS CHECK GOOD.