Perhaps their own maintenance engineers have spotted the trouble and fixed it.
或许他们的维修工程师查出了缺点，并且自行修理了呢？
In addition to design and development, many engineers work in testing, production, or maintenance.
除了从事设计和开发的工程师，还有许多工程师工作在试验，生产或维修领域。
Mechanical Engineer, Maintenance Engineer, Technical Supervisor, Technical Sales Engineers, boss and etc.
技术主管，技术销售工程师，工业老板等等。
Mechanical Engineer, Maintenance Engineer, Technical Supervisor, Technical Sales Engineers, boss and etc.
技术主管，技术销售工程师，工业老板等等。
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