Help: Left Channel of Technics 1300mk2 tt stopped

Using a beautiful Technics SL1300mk2 purchased from a fellow Audiogoner. The left channel of the turntable just stopped working the other day - it will sort of hum as I'm plugging it in but I get no music whatsoever. I've isolated the problem to the turntable for sure after replacing the phono preamp with a NAD PP-1 and changing the inputs on my Rotel RSX-1055 receiver (to both new inputs as well as switching R/L).

Any thoughts as to what could be causing the problem?

Thanks everyone!