With problems like this, I would always recommend getting in touch with your local Makita service agent, details of which will be on the Makita website, then using the dealer locator tab.
However, before thinking about taking the head off, have you checked all other options. Does the lock pin have free movement and is it well clear of the cast arm? Is the guard and guard release system working properly. The arm will not lower if the guard isn't retracting properly. You should also make sure the cutting arm linkage and spring are clean and lubed (WD40 should be fine). The arm is under tension due to the return spring so make sure that is secured/removed first, then remove the pivot pin and the arm should come away.
Click here for a diagram, the spring is on page 1, position 13 and the pivot pin etc is on page 2, pos 85/86/87/96/95. The guard and associated parts are also on page 1.
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