What was found
AUTO-FLIGHT STATUS ANNUNCIATOR ILLUMINATING SPORADICALLY WITH NO MESSAGE ASSOCIATED ON FMC DISPLAY. WHEN THERE IS A MESSAGE THAT IS CLEARED VIA THE FMC, THE F/O'S AFSA REMAINS ILLUMINATED UNTIL MANUALLY CANCELLED. ACFT GROUNDED. VERIFIED FAULT. MOVED XFR SW TO R FMC AND FAULT WENT AWAY. VERIFIED LT FMC BAD. REPLACED NR 1 FMC WITH SERVICEABLE ONE. ACCOMPLISHED SOFTWARE CROSSLOAD. INSTALLED PERFORMANCE FACTORS. ACCOMPLISHED FMC OPS TEST, TEST PASS, IAW AMM 34-61-02-400-801.