David,
Sorry to hear about your continued issues. I am sure you want to get the mount operational ASAP. As per the other replies, the 76 seconds error is always due to the bearings and the way they are loaded. If you review the Losmandy videos on worm adjustments. you will see about the need to compress the right block towards the left by squeezing together before tightening the worm block screws. This action might solve your problem and the error could be reduced or go away (as per Henk and Chip).
Potentially the bearings could be mis-inserted or misaligned as they sit inside the blocks and the ball bearings are not riding inside the races at the right angle. You might ask for new bearings and blocks to rule out that possibility. Then there is what you may want to try on your own or have the factory redo. But that is between you and Losmandy on what they cover or recommend.?
Good luck,
John
