As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADAR ALTIMETER FAILED ON RUN-UP. AVIONICS GOT IT WORKING ON BATTERY POWER ONLY, BUT AFTER ENGINE START WITH AVO MASTERS TURNED ON, THE RADAR ALTIMETER READOUTS ON PFD/ND WERE BLANK. REMOVED AND REPLACED RADAR ALTIMETER IAW NAV/COM MANUAL 34-41-01. MOC OK.