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This scanner uses SMT parts and a multi-level board. If RF from your Yeasu cooked it, you have no choice other than to send it in for repair. Unless you have access to SMT equipment and understand you can't repair traces on a circuit board with multiple levels, you are sunk. Send it in for repair. They will shotgun the board and get it back to you.
You can replace your audio and receive transistors with a new one or a compatible one and be back on the road again. the transistors are available from all ham dealers and are normally not too expensive.
do not try to fix something that ain't broke. if it is working, leave it.
This sounds like a current problem which means that the batteries are not providing enough current to the PA section of the radio. It's time to replace the battery. The average lifespan of a rechargable battery is 18 to 24 months. Just because the battery shows the proper voltage does not mean that the battery is good.
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