You need to decide. Either what you have is acceptable or it is not. If it is not and you plan to sue, then don't cash the check. Don't cash it without first deciding, based on a "maybe". But you should not sue without trying to resolve the issues first, and I suggest you consult a lawyer to learn the laws that pertain to your state. Although they vary from state to state, many are the same across the board. It will cost you about $125 to file suit and probably $150 to serve it. If that is acceptable to you, then try and resolve it and sue if you must. See a lawyer first though.
Certified Paralegal, with 25+ years' experience & with Landlord & Tenant law experience.