What was found
NR 1 IRU FAILED, NR 2 ALREADY DEFERED, ALONG WITH BOTH PITCH TRIMS AND NR 1 YAW DAMP, NR 2 ALREADY DEFERRED. ONLY BASIC RAW DATA AVAILABLE ON FO SIDE. MADE EMERGENCY LDG AT LAS. ALSO, NR 2 ATS DISSENGAGED AND WOULD NOT ENGAGE. MEL: SWAPPED IRS NR 1 AND 3. DEFERRED PER MEL SYSTEM 1 NOW OK. REMOVED AND REPLACED NR 3 IRU AND 317 FP RELAY, GND CK GOOD. NR 2 IRS CLEARED PRIOR TO DEPT LAS VEGAS. SWAPPED DC POWER RELAYS 315FP AND 316FP WITH NR 3 SYSTEM. NR 2 IRU NOW OPS CHK GOOD.