As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FO SIDE COURSE WINDOW AND CDI WON'T STOP SPINNING. BEGAN SPINNING 3 HOURS INTO THE FLIGHT WITH OUT INTERVENTION FROM CREW. GROUNDED - YES. VERIFIED - HARD FAIL. CYCLED MCP C/B'S AND A/C POWER W/NO HELP. REF AMM 22-11-34, REMOVED/REPLACED MCP. OPS NML REF SAME. DISCREP CLEARED. 9 EA C/B'S MIG 51A TAGS INSTALLED/RMVD. ALL TESTS/LLM TESTS GOOD.