Hi Harry,

Thanks for the info. We recommend that you run the engine again and see if it is still operating normally with no unusual noise and vibration before sending the turbine for service.

My only guess is that thermocouple's material and sensitivity may have been deterorated with operating time. Even if the probe's tip is designed to withstand high temperature, repetiitve exposure to turbine's operating environment may have effect on the sensitivity. Aging?

Regards,
Kraivuth S.