Arrived on site customer stated that kitchen sink would start gurgling every time toilet was flushed. Gave multiple pricing options at this time customer agreed to pulling the toilet and inspecting the sewer line. Attempted to camera through toilet at this time was not able due to cast iron fitting. Informed customer of issues , at this time reset toilet and tested for leaks. No leaks found. After resetting toilet kitchen sink would no longer make gurgling noise when the toilet was flushed. Ran multiple fixtures to see if blockage would occur during test. No signs of stoppage found in fixtures. Informed customer and will be sending quotes for a two way clean out and removal and replacement of cast iron stack. Cleaned area after service and inform customer of work done. Thank you for choosing CPI Plumbing and Heating Inc.