As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GARMIN SELF-TEST, THE DATABASE WILL NOT READ, RESULTING IN A BAD SELF-CHECK FOR GLS 1 NOT GIVING HALF LEFT AND HALF UPSCALE DEFLECTIONS. THE ND REMAINED IN EITHER THE VOR OR ILS MODE FOR THE CHECK. REPLACED #1 GNS-430 IAW CMM 145MMS-023.