What was found
EMERGENCY DECLARED, IN CRUISE EXPERIENCED AIRSPEED UNRELIABLE SITUATION PER QRH CHECKLIST WE DETERMINED THE LEFT SIDE WAS UNRELIABLE. DUE TO NON SPECIFIC FIM TASK, USED FAULT CODE INDEX WITH CODE 34 12 77 01 REV 149, REPL L ADC IAW AMM 34-12-01/401 REV 149, ADC TEST SATIS NO FAULTS, MCDP 30 TEST C/O IAW AMM 22-00-02/201 REV 149, TEST SATIS, NO FAULTS. DETAILED INSP C/O IAW AMM 34-11-01/601 REV 149 & NO FINDINGS.