Gas sensor type:O3 Sensor failed at 09:31 on 04 Dec 2018. Failed sensor serial number:204030850 (Date Code 126) Serial number of new sensor:204640910 (Date code 058) Notified 05/12/18 Received 11/12/18 Replaced 12/12/18 Please allow 2-3 days for new sensor to stabilize.