HI, I've been to the Ibanez site and although I didn't find your actual model I saw how Ibanez tremelo arms are designed.
They look very similar to the the set up of a stratocaster - where the bridge springs are located behind a cover on the back of the body.
I was warned about Stratocaster tremelo problems as a young guitarist
I think its a common problem.
I think you've inherited the problem from someone who loved the whammy bar
Have a potter about..........