Leaky Braun drip coffee maker (type 3123/KF 190)

I have a 20 year old Braun drip coffee maker “cappuccino” with steamer wand. It’s great. Would hate to toss it out. BUT for the past couple of months it’s been leaking from the base if the water sits in the tank for any length of time. I tried descaling with vinegar ( though I admit it HAD been a while). Base is attached with one deeply recessed triangular-head screw and a warning says “…Do not remove this cover. No user serviceable parts.” Steamer wand also is not delivering steam to the milk — just air. Not as big of an issue since coffee is daily, and cappuccino— not. Can it be fixed ? Thanks!