Assuming they were the right bolts to begin with, torqued down to the proper specs. $$$$ As far as 3rd party inspections go it's hard enough to find anyone to service this equipment let alone inspect it. Sign companies repair when it breaks and expect the driver to be the inspector or "fall guy". Most of the time the driver is barely a sign guy to qualify as aerial equipment inspector. The equipment may also have been used past it's limits many times to weaken the bolts as in extended all the way out at almost a horizontal angle. It happened to a 100ft Manitex bucket that was nearly all the way out installing a sign 20 ft off the ground. Can you say pop the bolts like popcorn.