Hello together my great Volvo S70 built in 1998 presents me again with a big annoying challenge. The central locking works perfectly with the remote control, all doors open and close excellently. However, for a few days the tank cover can no longer be unlocked or opened. In addition, the ZV can be opened and closed with the mechanical key at the driver’s door, but only the driver’s door opens and closes. With the FB opens and sc The fuses have been checked and are all in order. Have I missed any? How can the tank cover be opened and closed? Thank you in advance. Greetings from Switzerland Gianni