Tonearm issue

JA Michell turntable with Tecnoarm working perfectly last night when the left channel went out. After determining that the issue was not in phono stage, amps, or preamp, I narrowed it down to the left side (blue and white) wiring in the tonearm (or the left side RCA plug).  Rather than purchasing an entirely new tonearm, I figure best option is to replace either the wiring, RCA plug, or both. Has anyone done this on a Tecnoarm?  Is it difficult?  YouTube video and Google searches didn’t turn up much.