Drivers door on my '96 300 TDI wouldn't close. Replaced lock (pig of a job) but now central locking doesn't work properly. When I lock the drivers door from the inside, all doors lock then unlock immediately but drivers door stays locked. Luckily I haven't put door panel back on so I can still open it from inside. Same thing happens when I lock from key fob but then alarm goes off. Anyone had the same problem?