Here is a copy of what is on my website.
Pre-Purchase Survey
This is the most comprehensive type of survey and is strongly advised when purchasing either a new or used vessel. Condition and overall operation of the vessel should be examined. This covers structural integrity, electrical systems, the propulsion system, the fuel system, other machinery, navigation equipment, miscellaneous on-board systems, cosmetic appearance, electronics, and overall maintenance, as well as, an out of water inspection and a sea trial.
You can include fluid sampling,compression testing,live data testing and thermal imaging to this list.