What was found
CLIMBING THRU 18000 FT FA'S REPORTED FUMES/AMMONIA SMELL FROM ROW 26-TO 29. GRUADUALLY DISAPATED-PERFORMED TSM 05-50-00-810-831-A DUE TO AMMONIA SMELL IN CABIN. PERFORMED LEVEL A DECOMTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM IAW AMM 21-00-00-615-802-A. NO EVIDENCE OF AMMONIA SMELL. AC OKAY FOR CONTINUED SERVICE DESCRIPTION OF ODOR/FUMES: TEMPORARY, AMMONIA SMELL. APPARENT CABIN SOURCE: UNKNOWN. ROW 26 TO 29. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.