Panasonic SB-WA870EB Service Manual page 9

Step 11: Remove the subwoofer by detact the 2 wires.
Step 12: Remove the screws.
Step 13: Pull out the Power Amp unit slightly as shown.
Note: Be careful of attach wire at CN606.
Step 14: Release the connector CN606 then pull out the entire
Power Amp unit.
Step 15: Remove all the screws.
Step 16: Release the connector CN507 to remove the rear
panel.
Step 17: Remove all the screws.
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SB-WA870EB / SB-WA870EG