Myself and a friend purchased the same type of radio the same day, mine has had a easy life by being used as a base his on the other hand has had a rough life living in a dump truck hauling rock, asphalt things like that. To make a long story short he had some issues with his got the parts to fix it include in the fix was a new set of driver and finals. We are looking for the "Service Manual" to do an alignment on it which we have had zero luck locating one. Or someone oout there that knows what adjustment location does what. It would be a great help to both of us Thanks.