The customer reported that the celldyn ruby fans were not functioning.The field service engineer (fse) found the presence of soot on both of the fans.The fans were replaced and instrument performance was verified.Inspection of the returned parts (fans) found discoloration of the magnetic coils of the fan and the presence of spider webs.In addition, a burn mark was observed on the pcb, and the center column of each fan was found to be off-center, indicating overheating; however the cause of the overheating could not be determined.Customer complaint data was reviewed and no adverse trends were identified.Trending data does not indicate other fans being off center.The cell-dyn ruby operations manual was reviewed and was found to adequately address the issue.The investigation did not identify a product deficiency.
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