EE ALLEGES THAT HE WAS EXPOSED TO FUMES FROM CVUTTING OR WELDING. HE IS NOT SURE WHEN THIS OCCURRED AND THINKS THE ACTIVITY TOOK PLACE AT OR NEAR THE (003) 1ST LEFT TAILPIECE ON 8-11 OR 8-12. THIS 7000-1 IS BEING COMPLETED UNDER PROTEST. ACTURAL DIAGNOSIS AN CAUSE HAVE NOT BEEN DETERMINED. THIS INCIDENT IS STILL UNDER INVESTIGATION.