Customer called us back out for a tankless flush and to look at the kitchen sink that had intermittently been backing up. Informed customer that their last flush wasn’t quite a year ago, but due to the amount of reschedule credits acquired it’s worth it to go ahead and do. Recommended using the holidays as a time marker for future maintenance so that it’s done closer to a year in the future. Filled and drained sink twice as well as ran water for 5-10 minutes. The sink didn’t back up. Informed customer that running a snake is mainly useful for sinks with an active stoppage because it will poke a hole in the blockage. Sink water is flowing well and there are currently no backups recommended a bio cleaning agent for the health of the sink drain. Found vegetable peels built up inside disposal. Cleared veggie peels with a cup of ice. Flushed the tankless unit, cleared the inlet screen and tested for proper function. Everything is working as intended. No leaks found at this time. Let custome