As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WOW MISCOMPARE AMBER CAS: UPON GEAR RETRACTION COMMAND THE GEAR HANDLE REMAINED IN THE DOWN AND LOCKED POSITION. THEN AN AMBER WOW MISCOMPARE CAS DISPLAYED ALONG WITH GROUND IDLE AND OCASSIONALY THE HP VALVE CLOSED L/R. WE RAN APPROPRIATE CHECLIST. CAS MESSAGES REMAINED DISPLAYED AND GEAR HANDLE DOWN AND LOCKED. WE RETURNED TO AIRPORT UNEVENTFUL LANDING. CORRECTIVE ACTION; ROLLER ON LEFT WOW SWITCH IS MISSING. REPLACED WOW SWITCH. RIGGED AND SAFETIED. OPS CHECK GOOD. IN REF TO CE-680A AMM 32-60-05 AND 32-60-00.