For future reference, a camera can be very handy for finding problems. This one works with your phone and for $13 it is a no brainer. I use mine on my motorcycle, camper, etc.
https://www.amazon.com/gp/product/B07P24C2PQ/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1