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There is no need to send the radio to some unsanctioned moonlighter.
I normally don't recommend clipping parts but for this radio there is not much else to do and it looks OK on an Oscilloscope too. Clip diode 205 to increase modulation. Then take a plastic flat tool and spread L 203 coils apart about a 1/8" each, nice and even and make sure they don't touch any metal.
How many watts does it do? If it swings say: 1.5 watts up to 4 watts, someone has installed a swing kit which has a very small carrier. In AM, carrier is not important, its modulation and swing that makes it loud. If its low Audio modulation then it may be that final has went bad too.
DO NOT CLIP THE LIMITER! You may wind up with splattering audio. The best thing you could do is find the modulation pot and turn it a bit to achieve more modulation. I am not familiar with your radio, so I could not tell you where that pot is. You may be disappointed in the results if you clip the limiter.
According to the service manual for the TRC-447, the only adjustment is for "power" which is #L205. The only other step in the transmitter alignment is for the "S" meter.
On the Cobra, VR4 is AMC, L14,L13,L12 is AM power.