Update.....got the new bolts installed, bled the system.....motor STILL bled down about a third of the way, then stopped solid. Would not stay fully up. Decided this was not a seal problem or it would go all the way down, like it did before I replaced the VB. Got to thinking I must have damaged the tilt cylinder several months ago when I removed the cap without using the proper tools. Talked to Franz Buddenberg again...he said I may have crushed the cylinder slightly near the top end causing the cylinder to be out of round enough where the seal on the piston couldn't hold pressure. When the piston got past the bad area it would seal again and stop. So I bought a rebuilt tilt cylinder from him, installed it today, and problem solved.