The Model 250 operational maintenance manuals include the standard section on trend monitoring procedures, incorporating corrective factors for ambient temp, altitude, etc.
With regards to electronic power check programs, there are a number of unendorsed third party trending systems available, including Shadin's ETM and Altair's IntelliStart Plus.
For further info, you can email the 250 customer support team via
[email protected].
Cheers,
t/shaft