貌似没有啥问题，但是个人觉得用called更自然一点

try to split it in different sentences

contact 可以是及物动词也可以是不及物动词 但此处最好加个with

We contacted the boiler company, and the water treatment company immediately came to
the hotel to check the pipeline. They found the No.3 boiler pipe was leaking.

你先想想中文是怎么表达的。。首先应该是发现 然后处理 最后报道

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We contacted the boiler company and the water treatment company to check the pipeline immediately after we found that the no 3 pipe was leaking. 不需要说来酒店

goodboy？

三个介词错误
immediately 后面的那个to多余了
for要改成to 表目的
再把 after finding 改成and found

After discovering a leak in the No.3 boiler pipe, we contacted the boiler company and the water treatment company immediately, requesting them to come to the hotel for an inspection.