签订合同的电梯维护人员已经在进行必要的修理工作。
The elevator maintenance crew under contract has been making necessary repairs.
收回通告制造商对被发现有缺陷的产品发出的回收通告，以便进行必要的修理或调试。
A request by the manufacturer of a product that has been identified as defective to return it, as for necessary repairs or adjustments.
修理故障。修理线路的问题，更换有故障的部件，有必要的话，对需要调整的部分进行维护。
Correct the trouble. Repair wiring problems, replace faulty components, and service of adjust parts if necessary.
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