I worked 1 similar kind of job, was a supermarket. EC A had gone bankrupt. EC B took over on a T/M basis. I worked for EC C, that B had hired to help out. Almost no wire had been pulled, about 75% of counduits had been run. Some were good, some went nowhere, some stubups were buried in concrete, etc. In this case, B fixed all the problems along the way, as he had to to complete the job. Of course, with A out of business, warranty was on B. From conversations, I gathered if some work had been completed, they would carefully inspect and test as much as possible before committing to warranty coverage on that portion.
EC B was one of the better co.'s in our region, had lots of good mechanics. Their foreman was top notch, always knew what to do. 2 other EC's also had guys there. Best example I ever saw of guys who didn't all know each other working hard to fix a job and make it good.