Panasonic SA-AK630E Service Manual page 24

Step 1 Remove 2 screws fixed to the Power Amplifier IC and 1 screw to Voltage Regulator.
Step 2 Break the joint with a metal cutter as shown below.
Step 3 Unsolder the terminals of Power Amp IC, transistor and replace the components.
Step 4 Fix back the cut portion with a screw as shown.
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