This dealer trainers only.
i went there 5 times- 2 times for service and 3 times to replace it.
both the time after service the chain is automatically loose. and when i personally went there to replace it then it works for months. both the time i have faced the same problem.
today the chain is broken automatically and stack in rear tire. I am safe by god grace. I don't know your quality is worst or employees are worst or both.
today i realize that after service on time we should not rely on the machines