Customer stated that there was 2 toilets backing up. Upon arrival check for clean-outs around home. Found clean-out in crawlspace and started flushing toilets. In crawlspace saw water flowing past clean-out and didn’t notice any backing up at this time. Flushed both toilets over 10 times. Stated to customer if issue happens again call septic company first because customer stated that septic has been serviced in at least 6 years.