There is hardly any information here. Oxygen is obviously highly reactive, and certainly has the potential to react with many contaminants which may have been in the system. I would start by contacting the oxygen supplier for recommendations on an expert who could help in the investigation, or, if the facility has its own oxygen plant, talk to the supplier of the technology. The note appears to come from India, perhaps there is some kind of a trade association of oxygen or gas manufacturers there which would be able to help to find a contact.