I would call attention to:

300.7 Raceways Exposed to Different Temperatures

(A) Sealing Where portions of a cable raceway or sleeve are known to be subjected to different temperatures and where condensation is known to be a problem, as in cold storage areas of buildings or where passing from the interior to the exterior of a building, the raceway or sleeve shall be filled with an approved material to prevent the circulation of warm air to a colder section of the raceway or sleeve.

Is the cabint enclosing the panelboard on the other side? If so, can you post a picture with the cabinet front removed, close up image showing all if the interior, please.

PS: I would also cite the damaged insulation on Phase B.

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Joe Tedesco