As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK - RADAR UNSTABLE IN LEFT TURN, FALLS OFF AND PAINTS THE GROUND IN RIGHT TURN. FO'S GYRO ON AUX, NO HELP. REPLACED RADAR ANTENNA AND R/T, OPS CHECK GOOD REF LOG 7476120. TWO MINOR DEGRADATION DISCREPANCIES IN LAST 30 DAYS, R/T REPLACED 21 AUG 99.