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On the following page, go to the section labeled 'Checking Bipolar Transistors'. Under the two images, you will find a link to a form that will allow you to enter all of the values with the various lead configurations. Follow the instructions and send me the zipped file with the images. There's a link for my email address. Testing results are more definitive when the transistors are out of the board but initial testing in the board is reasonably reliable.
If the amp goes into protect with the wires unplugged from the board, the amp likely has more serious problems. It may have a shorted power transformer and almost certainly has shorted output transistors. If you think you may want to try to repair it yourself, read through the following page (particularly the information in the yellow box). Respond to this post if you have more questions.
This indicates a possibility of a power supply issue, you may have to open up the unit and take voltage measurements to determine if the voltages are correct. In order to do this you will need a schematic diagram of the unit. Once you have the schematic you will be abor to tell which voltages are legitimate. I hope this helps