vsa/abs/handbrake light [CL9]

hey guys, i drive an 06 accord euro and as the title suggests... i'm having issues with the abs/vsa system... i'm driving along then the handbrake, vsa, abs lights are on and the multifunction display tells me to check the system... this happens intermittently though... last time i brought it to service they couldnt bring out the fault codes, i'm not sure if its the handbrake sensor, the abs sensors on the wheels or the vsa system that is at fault... what do i do now since its an intermittent problem?