If your medical hasn't expired, you still have to go for it. However, the medical only consists of certain stations (like seeing the doc face to face). This is because once you have taken your initial (where you go to the specialists), you don't need to do it again. It's CAAS ruling where they will mark you off that you have passed. Since you have passed, go down, tell them about it. Most likely, as I said you might just need to go through several stations, or even none at all. But make sure they inform CAAS about you, such that your information will be submitted to SIA.