A retorque isn't going to fix any problems... If you've already got problems it is a band-aid at best. If you've got no problems and it works, you'll never know.
Do know that with a retorque there is always the possibility of making a problem worse or of creating a problem where there wasn't one. You can compromise the head gasket by retorquing... generally this is caused by backing off the bolts too far or from the metal jackets in the head gasket having gotten brittle and now cracking opening pathways for erosion.
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