You could check to see if they are sticking. Take the top cover off the adjuster. They unscrew. Stick a thin blade screwdriver in and wind the adjuster back up. Then release the screwdriver, if you listen carefully you should hear them ping back.
I warn you though, the front one is nigh on impossible to get too. Most people have found it easier to actually take the adjusters off to free them up. If you do go down this route, be very careful as they have gaskets that can break. If you break one they will leak oil and you will have to replace the gaskets.
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