The customer called a siemens technical support technician (tst) to report the discordant ammonia results.Initially, the customer obtained a negative, out of range quality controls (qc) result.The customer repeated qc with the same cup and it resulted in range.A siemens customer service engineer (cse) was dispatched to the customer site.The cse replaced all l-rings, cleaned the reaction cuvette washer wud and oil bath, and replaced all fluids.The cse ran samples without any problem.The cause of the discordant ammonia results is unknown.The instrument is performing according to the specifications.No further evaluation of this device is required.
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