Shower Drain Needs Replacement HELP

I had someone come out and pressure test my showers as the vinyl pan liner had been cut out as it was holding water a few months back and tile was delayed. He says that in one of the showers on a slab, there is seepage, based on him pumping up the drain line between fittings using inflatable baloons. His price to replace the drain line is very expensive. Most of it is to demo the concrete in the shower so he can get to the drain and replace the section to where it hits the T. I am considering breaking it out myself and just having him do the drain work. It this a difficult job. Would a hammer drill and or a jack hammer work. I guess one just has to be careful not to hit the line!
Also he says that the drains should be power cleaned with a jet and that the drain in the shower is 1 1/2" and should be 2". Also, what is in there now is a vinyl shower pan as is upstairs in the house as well. After the drain is replaced, do you folks recommend a vinyl or hot mopped shower pan? Can someone help? Thanks.
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Here is something for you to consider--just went through having the cement floor dug up to replace a shower drain. They did it by drilling a row of holes close together from one end to the other on both sides to the trench to be dug out. Then broke the cement with a sledge hammer. If you had any damage as a result of the leak (look real, real hard) it might be an insurance issue. Changing from a 1 1/2" to a 2" drain is a code issue and a change that is required to bring it up to code. If there is damage (water or otherwise as a result of the leak) then it most likely will be covered by your home owner's insurance. If so, then the drain replacement will also be covered by your home owner's insurance. The reason is that in the process of repairing any covered damage, upgrades necessitated by code requirements are covered by the insurance company. This is all assuming that you have this type of coverage in your policy. I had to have the drain replaced, additional vent system piping, exhaust fan and GFI installed and my electrical service upgraded-- all to bring things up to code. Insurance company is picking up the tab for all code issues. MLD

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