I have 2000 C280 Sport. My trunk won't open with any method. I don't even hear the trunk releasing or unlatching. My remote won't open it. The pull tab on the center console won't open it. Even when all the doors are unlocked, the trunk push button on the key hole won't open it. What can be wrong? Has anyone experienced this before? I check all the fuses and they are fine. I would try and use my key but the trunk key hole is so corroded that my key won't even fit in the key hole. I bought the car with the trunk key hole in that condition and I don't think the trunk was ever open manually with a key before. Need help