As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WOULD NOT GO INTO TEST MODE. ALSO HAD FALSE TARGETS ON HIGH RANGE SETTINGS. FOUND DISPLAY TEST PATTERN INTERMITTENTLY DROPPING OFF. FOUND LOGIC NR 1 BOARD CAUSING PROBLEM. REPLACED LOGIC #1 BOARD FROM P40 INDICATOR. REPAIRED. BENCH CHECK GOOD.