As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR STABILIZATION APPEARS TO BE INOPERATIVE RADAR RETURNS ARE DISTORTED WHEN AIRCRAFT PITCH AND OR BANK ANGLE IS ALTERED. WX RADAR FAILED INFLIGHT. AIR RETURN TO MSP. MAINTENANCE COULD NOT DUPLICATE RADAR SYS AND STABILIZATION OP CHECKS GOOD IAW SF340 M/M CHAP 34.