As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS POST C-CHECK TEST FLIGHT- AFTER TAKEOFF L/G LEVER WOULD NOT GO UP AND MULTIPLE EICAS MESSAGES. A/C AIR RETURNED WITHOUT INCIDENT. MX REMOVED CLEANED AND RE-INSTALLED WEIGHT ON WHEELS PROX SWITCH CONNECTOR AND OPS CHECKED GOOD. SECOND TEST FLIGHT SATISFACTORY.