Hi we have a Chausson flash 20 2014 fitted with a CBE150tr control panel and CBE fuse board DS309TR. We have owned the van for around 6 months and travelled extensively Morocco and Spain during that time with no problems. The van was stood for around a month. On return we found the 5amp fuse in the boite de securitie was blown and no 12v power nothing on the control panel. We have replaced the fuse and it blows again in one or other of the two boxes. We have disconnected the 16 core cable between the control panel and fuse box at both ends. The fuses are stable. If we reconnect the cable at the fuse box only, the fuses blow. The fuse/fuses still blow whether or not mains electric is connected. Both leisure batteries are under a year old and showing fully charged and we have a solar panel. An experienced engineer spent 3 hours last week and could not find the fault except perhaps suspecting the cable it’s self. Has anyone got any ideas. Any advice or suggestions gratefully received. We live in France and it is difficult to find specialists who can help. Thank you in advance