I'm finding state cures can only be made within 30 days.
RESPA does not prohibit processing the cure after 30 days. The 30 days is your grace period. If you cure within 30 days you will be considered to have cured your violation of Sec. 5 of RESPA.
If you cure after 30 days you can still be cited for a violation but that will probably be all. If you do not cure after the 30 days you will most likely be cited for the violation and where you have 3 such loans an additional cite for a pattern and practice of violating Sec 5 can be cited and additional penalties could be added on top of a being ordered to cure.
My advice is to self-cure regardless when the tolerance violation is found.
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The opinions expressed are mine and they are not to be taken as legal advice.