It happened to me with my LAM. First tech that fixed it left out a screw. Second tech "cracked" the head" and couldn't get it back together. By the time the third tech got it, it was so far out of timing that I had to send it back to the factory to be reworked. In the meantime it was my busiest time of the year and could not be without my LAM, without losing a lot of business. Bought a second head for the LAM. Now I have two LAM heads in case I ever have down time.
Sorry to hear of your misfortune. It stinks.