Yup; here it is, from the KPA 100 Manual:

IMPORTANT: The hardware holding the RF power transistors in place will loosen 
slightly during initial use. After 5-10 hours of normal operation at 50 watts 
or more, remove the KPA100 assembly and its shield, then re-tighten the 
mounting hardware for Q1/Q2 approximately 1/8 turn.

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