They make all sorts of inspection cameras that you can hook up to your phone. Maybe something like this can be lowered down through the toilet for a looksy....talk about a total shit show.....

https://www.amazon.com/Inspection-Fantronics-Waterproof-Borescope-Adjustable/dp/B071HYRPND/ref=mp_s_a_1_10?crid=15HFUIKY0EL7&keywords=inspection+camera+with+light&qid=1666809892&qu=eyJxc2MiOiI1LjUwIiwicXNhIjoiNS40NSIsInFzcCI6IjUuMDgifQ%3D%3D&sprefix=inspection%2Caps%2C179&sr=8-10