While driving, when I get off the gas approaching stop, revs and doesnt downshif

Hello, transmission gear engagement is commanded, then executed electronically -- with mechanical components doing the work of shifting. It's hard to know if your problem is with what was commanded, what was electrically activated or what was mechanically shifted. Testing is needed using a diagnostic tool that can monitor component operation, used by a technician with skills to know what to look for, referencing shop manual information.