As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEPARTING SAN, LOCAL APPROACH REPORTED THAT THE 3RD DIGIT ON NR 1 TRANSPONDER WAS SHOWING A DIFFERENT NUMBER THAN WAS ASSIGNED. TRIED NR 2 TRANSPONDER AND IT WAS TOTALLY INOPERABLE. WAS TOLD BY DISPATCH TO DIVERT TO LAX. INSTALLED NEW CONTROL HEAD CTRL 92 AT NR 1 TRANSPONDER. PERFORMED TRANSPONDER TEST SEQUENCE WITH TEST BOX AND PITOT STATIC CHECK FOR ALTITUDE READ OUT. ALL CHECKS GOOD.