Are you questioning what tripped the unit during startup or should a high exhaust temperature deviation trip the unit during startup?
On our W20V34SG machines with either WECs8000 or UNIC we do experience shut downs during startup for “SHD, Low Exh gas temp. cyl xxA/B. I’m not sure if the shut down is a deviation from average temperature or a lower than expected rate of temperature rise.
You should be able to review either your Event list on the WOIS or the EDL log in WECsPlorer to see what is the primary cause of shutdown.