NASHVILLE, Tenn. -- There are questions concerning why tens of thousands of tax dollars have been spent to fix problems in Nashville's new courthouse.

Video: 2-Year-Old Building Costs Taxpayers Thousands Of Dollars

The A.A. Birch building may look great from the outside and appears to be state-of-the-art inside.

However, in two years of its existence, there have already been many costly mistakes.

What Channel 4 News found has council members on the city's finance committee asking who is being held accountable.

"Somebody failed to do their job properly, apparently," said councilman Duane Dominy of the Metro Finance Committee.

The I-team has obtained invoices and e-mails, which reveal the problems have cost taxpayers $78,142.

How did the costs get so high?

During the first months that the new building was used, judges complained about hearing toilets flushing in courtrooms.

The solution was to put in more insulation to mask the sounds, which cost taxpayers $21,415.

Then there was what invoices called the "flood emergency." A broken sprinkler in the criminal clerk's office soaked computers, printers and phones.

Also, a broken air conditioner system soaked, among other things, Judge Leon Ruben's desk.

Finally, a busted pipe flooded several offices. The invoices show that for seven months the city had to pay an engineering company to clean up the mess.

The city also had to pay for dehumidifiers to be brought in for 13 days. All that and replacing carpet and other ruined materials cost $51,000.

Finally there was a broken garage door to the judge's private parking garage.

The costs to fix it were covered by warranty, but security guards had to be posted there 24 hours a day for two weeks because the door was stuck open.

The total for those guards' overtime was $5,727.

The flushing, the flooding the overtime has led up to the more than $78,000. That cost doesn't sit well with members of the city's Budget and Finance committee.

"My question is who can be held accountable for not doing their job properly?" said Dominy.

The city has now called back in all the original architects, engineers and contractors of the building to fix the problems. But all of the problems that have been discussed in this story are not under warranty, so taxpayers have to pay for it all.

Then, as a handwritten note on an invoice suggests, all of the costs will be turned over to the legal department, meaning the city will try to get its insurance company to pay it back.

With the city making budget cuts, can it afford nearly $80,000 in unforeseen repairs to a 2-year-old building?

"We can't afford to do that, but the challenge is we have to do that," said Dominy.

There's additional problems with the building about which Channel 4 also learned. It turns out the heating and air conditioning system was vibrating excessively and wasn't cooling parts of the building properly.

It required extensive work to fix, but it is covered under warranty.