whats the meaning of this sentence?repairing you self end minus from cost of products?

问题描述:

whats the meaning of this sentence?
repairing you self end minus from cost of products?

首先这句话好像不对.应该是repairing yourself and minus from cost of products,
大概就是 自行修理的费用从商品价值中减去...大概吧