Issue with predator

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Romegoth

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I had a hum issue with my predator, on closer inspection I found resistors R12,R6,R105 and R112 (there may be others) to be cracked and signs of heat. The amp is a little old now (version 3 2005) and still has the original valves. Any ideas as to where I should start troubleshooting ?
pictures attached
regards
Mike
 

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