As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: UNCOMMANDED A/T DISCONNECT ON TAKEOFF . WOULD NOT REENGAGE UNTIL CLIMBING THROUGH 1000FT AND V NAV. SELECTED. DISCONNECTED AGAIN WITH A/P B ENGAGED DURNING CLIMB AND LEVEL OFF. REENGAGED EACH TIME. ACCOMPLISHED SYS BITE TEST. SYS PASSED . ALSO A/T BITE TEST AND SERVO MOTOR TEST SYS. PASSED IAW AMM22-31-00.