What was found
DURING APPROACH INTO BOS, RECEIVED 'F/CTL ADR DISAGREE' MESSAGE. DUE TO SEVERE WEATHER IN THE APPROACH PATH INTO BOS, CREW ELECTED TO DIVERT TO PHL. AN EMERGENCY WAS DECLARED, AN UNEVENTFUL LANDING ACCOMPLISHED. MAINTENANCE REPLACED THE NR 1 AIR DATA INERTIAL REFERENCE UNIT COMPUTER, AND THE NR 2 SPOILER ELEVATOR COMPUTER. OPERATIONAL CHECK OK.