I've been here too. If possible, try and pull someone in who's familiar with the code to hopefully help you test and simplify it. 2000 lines of code is a massi

I've been here too. If possible, try and pull someone in who's familiar with the code to hopefully help you test and simplify it. 2000 lines of code is a massive amount of behaviour to understand. There's a minuscule chance you can infer all that behaviour from reading the code unfortunately.