you will find that when you strip it the chassis will collapse in the centre so be careful how you support it my series 1 chassis ended up in the pile shown and the rest in the vacuum cleaner
have you checked the relay base for good contacts as they us captured spade connectors and the contact area is very small and they have a tendency of being pushed back in the holder .the relay you have are they a well known manufacture and check to see if they are diode or resistor types