As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELEVATOR FEEL CAUTION LIGHT ILLUMINATED IN CRUISE. RAN CHECKLIST SLOWED TO 200 KTS AND DIVERTED. CAPTAIN'S PFD AND MFD HAD "ATT FAIL ", "HDG FAIL", "IVSI FAIL" RED MESSAGED. FAILURE OCCURED AT 25,000 WITH -43 DEGREE C OAT. LANDING UNEVENTFUL. PERFORMED A CLEANING OF NR 1 AND NR 2 PITOT/STATIC SYS. C/W LEAK TEST IAW TC 6341102. ALL CHECKS GOOD. REPLACED NR 1 AHRU IAW TC 63421010. ALL CHECKS GOOD. RETURNED TO SERVICE.