The owner's manual on my new bike (with the new Shimano Claris, not the old one with Octalink) asks me to do this:
After the first 20 km tighten the crankset and also tighten the pedals in the crank arms. Check if crank bolts are properly tightened. Check whether left crank arm screws are tightened firmly when bottom bracket axle is integrated with right crank arm.
I found many tutorials on the web they are about assembling the cranks, replacing them and they all include removing the cranks. But if I understand the manual, it specifically instructs me not to do that and leave such operation to a specialist:
Important warning! No check of crank arms fastening ... may result in ... Such damaged crank arms must be replaced with new crank arms. Please contact special bike service for crank arms replacement.