Another left motor gear failure, need a solution

I’ve done ‘feels like’ ~100 calibrations with ‘pull tight’. Running the first motors for 17 months but mainly on test with no long running hours.
The github shows a 30kg torque and the manufacturer page up to 82kg.
From the speed I guess the motors I revived as spares have 50kg.
It is confirmed now that I’m stalling the left motor with the TLE5206 on ‘pull tight’ and the motor confirms the stalling with a beeping noise device.
Measuring the amps is challenging with PWM because you need to do some logarithmic assumptions to get near real life values from what I read.
The full power on the left motor for 3 seconds to measure something I measure better by hand is worth a change. It can be destructive not only to the gears. Motor-shields (how many amps are actually flowing?), chains (length), power supply.

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