Lasvegasbuilder

Good afternoon. I am looking for some ADVICE. I have an in-ground gunite pool that is approximately 30 years old. I am trying to replace the light fixtures. I have disconnected the wires at the source of power and removed fro the niche. However, I cannot get the light / wire to pull out at all! I checked and there is no epoxy or putty at the pool end of the wires. Poured liquid soap into the conduit but it will not pull out. Any ideas? Thanks in advance!