Paul,
Welcome to the site. We have a ton of information on the TFM-15. You can start with checking out the owners manual and service manual. You can find these at the top of the page under Manuals and Specsheets. That will take you a page that by default shows you the Carver manuals. Scroll down the page (way down) and you'll find the TMF-15 docs. You can also access Phase Linear, Sunfire, Lightstar and Bob Carver Corp docs using the tabs at the bottom of the page.
You can find even more info if you scroll down the home page (again, way down) to find a forum dedicated to amplifiers. Within that forum you will find two subforms. One called Carver and one called amp repair. Both have dedicated sections for the TFM-15.
And don't forget the search functions. Upper right side of the home page. You can often find just what you need if you are good a formulating search terms.
Good luck and feel free to post questions in the relevant forums.