diplomat dishwasher?

Had problem with water leaking into the bottom tray; found leak after removing the external casing to the LHS - 2 no. joints in the big clear plastic moulding forming the water inlet - simple press connections sealed with 2 black O rings which have become distorted by limescale build-up - cleaned them but they still leaked, so sealed the joints with a poly pipe sealant. Put it all back together, tested it for a complete wash cycle, put it back under the worktop and blow me down - now the door latch won't lock ! Surpisingly this doesn't stop the machine - it still works but water leaks out the door now ! Anyone know how to get the door to lock ?