Check that all 4 wires on the cartridge pins and headshell or tonearm pins are tight.
Fixed?
To prove it is the cartridge coil, You can reverse the wires on the pins, put left and left ground to right + and -; and right to left. Now, if the left speaker is weaker, it’s the coil. If the right stays weaker, it is something else, put them back l to l, r to r
As it happens, I have my friends Benz Micro Wood LOMC here, the pins have colored rings. (good timing, I’m giving it to him tomorrow).
btw, if it is the coil, I’m fairly certain Steve Leung at VAS can repair it.
AI Quickie
"The standard color code for phono cartridge wiring is White for Left Channel Signal (Positive), Red for Right Channel Signal (Positive), Blue for Left Channel Ground (Negative), and Green for Right Channel Ground (Negative).
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White: Left Hot (+)
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Red: Right Hot (+)
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Blue: Left Ground (-)
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Green: Right Ground (-)
While these colors are standardized for most turntables and tonearms, the physical arrangement of pins on the cartridge itself can vary by manufacturer. It is crucial to verify the specific pinout in your turntable’s user guide or on the cartridge body, as some brands may use different color schemes or pin layouts."