The no-go items are *anything NOT mentioned in the MEL plus items that are in the MEL but with conditions that can't be met on the particular flight.
An example could be something allowed under the MEL for flight by day only - therefore is a no-go at night.
*Let's say an ITT gauge is NOT mentioned. It means it is a no-go.
MEL does not apply to minor stuff like seat covers - there will be a statement in the preamble about that.
If an engine has been running recently the residual ITT drops initially as engine is cranked due to cooler air blowing through it.