As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 190 - MEX-TIJ - AIRCRAFT RETURNED TO PLATFORM AS CONSEQUENCE OF FAIL IN THE RIGHT INSTRUMENTS PANEL. THERE WAS NO INDICATION IN FPD AND ND FIRST OFFICER SIDE, EFIS WAS SELECTED IN 1 AND THE FAIL WAS CORRECTED HOWEVER FAIL APPEARED AGAIN WHEN EFIS WAS SWAPPED, AIRCRAFT WAS CHANGED. SYMBOL GENERATOR WAS CHECKED, AND AHRS 2 CONFIRMED FAIL UNIT WAS REPLACED, TEST OK. (M)