Hello can one help me? was at the Tüv and the LWR does not. The hoses are all ok after visual inspection, the connections also. Everything looks purely optically good. However, the LWR nciht. Also under the battery the hose is great! How can not test whether a hose is broken or the switch? In addition, I heard that in the glove compartment there should be a Vakum valve A2026000178. Is this correct? and if so where can this be found? I already have a hose from the Lich t taken and closed with chewing gum to see if the other light is working, but does nothing. That means both lamps can be adjusted nciht. Would be great if someone could help me. Thank you and greeting Stefan