Customer said she heard a gurgle in the tub whenever she flushed the toilet in the master bathroom, upon arrival I tested the upstairs mainline to see if I could replicate the noise, and I wasn’t able to replicate the noise, but I did pinpoint that one toilet was not filling properly, so I gave her the option to replace that fill valve and after replacing it, the toilet is now filling, and after flushing a few times we still couldn’t replicate the noise that she was hearing. I’ll let her know if it keeps happening in the future to give us a call will come out and further investigate, but everything was fine with the main line after I ran all of my test