As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, F/O HORIZON WENT TO 6 DEG NOSE UP - HORIZON LIGHT ON - ON GO AROUND F/O SHOWED 15 DEG NOSE UP. CAPT 5 DEG NOSE UP. REMOVED AND REPLACED NR 2 VG AND NR 2 INSTRUMENT AMP FOR PRECAUTION. F/O HORIZON OPS CHECKS GOOD IAW DC-8 MM CHAP 34.