Thanks rwwear. Paul from EBC (thank you for replying !!!) commented regarding the suspicious caps
"they are not leaked. it is a glue the manufacture used to hold them in place. it degraded over the time and became cranchy but should not be an issue.does it have video menu when you connect it to a tv/monitor?".
Next, I will make a plate to fill the plate amp hole, get one of my class D amps and hook up to sub out of receiver and connect the Velodyne to the amp. See how it sounds.
Will also try if I can (as Paul suggests) to hook up to a TV/monitor.