I have some experience with the 742 but lots of experience with the 552.
They share a lot of design features.
Removing the trigger group is relatively simple with both but other then that I wouldn't recommend an inexperienced individual disassemble either any further.
The bolt can not be removed without removing the barrel and barrel removal should be left to qualified gunsmiths.
It's too easy to damage the gas port while removing the barrel and any damage to it can cause the rifle to malfunction.
I've never had to clean a 742 so can't comment on that.
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