My GB142 is leaking (only when cool) from what the parts listing calls the "drain plug" Part #80 on the diagram. I have been through the service manual many times, and can find no procedure at all that mentions this "drain plug".
Buderus GB142 Boiler Code 6A 227. 3 year old Boiler block leaking water in fire chamber. Parts needed not supplied with new block from Buderus . Item # 85 pump seals need 2 part number 15022s Item # 76 Double nipple THR / compression need 2 part # 75977 Watts dielectric unions 1 inc..