Thank you for drawing my attention to the relay box K40 (in my case K2 part no A 210 540 04 72). It has five robust open mechanical relays inside the cover, which were in need of a good clean at contact points. This I have done. No more (red and green lights flashing) starting problems so far. Was able to remove unit for cleaning by disconnecting the live 12 Volt plug (B) first, then the others. Hopefully this will solve my problem and the info will be of use to others. Ed