As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS MSG TCAS DISPLAYED WHEN GEAR RETRACTED MSG WENT AWAY WHEN GEAR EXTENDED. A/C HAD AN AIR TURN BACK DUE TO EICAS MSG TCAS DISPLAYED WHEN GEAR RETRACTED MSG WENT AWAY WHEN GEAR EXTENTED. ACCOMPLISHED INSPECTION OF RACK CONNECTORS AND WIRES FOUND C/P DG085P CAUSING FAULT REPLACED C/P AND COAX CABLES PER SWPM AND WDM 34-45-11 AND 20-51-15 SYSTEM CHECK GOOD (ITEM CLOSED)