If the tentioner was the issue, getting a free balancer was about all MB accepts responsibility for. If they combined fixing the leaks (which probably have been there) you might have saved some labor having them done at the same time. It is logical for them to find these other problems while working in this area. The balancer would have only been the problem if it had come apart. The cracks would only be a warning if caught in time.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician