Sent down to test sensitivity of the new smoke detectors that were added and also test them as well. Panel had troubles on it upon arrival. Troubles on zones 2 & 4. All except the North Hall and office smoke were fine. Office smoke was not replaced and needed to be. Hall smoke had no power. Found smoke was not wired correctly. Rewired smoke and tested. Working properly. Replaced smoke detector in office and tested. Working properly. Figured out the troubles on the panel zones was because there were no End of Line resistors on those loops. Who ever changed the smoke detectors out didn’t put them back in place when they replaced them. Panel still shows a NAC 3 trouble upon departure. Advised customer of the situation and told her we would have to make another service call to track the issue out. This call is for finishing fixing the panel troubles.