Howdy ya’all Not new to following the site but haven’t post previously. Pardon in advance for my fumbles as I figure this out. Attempted to search previous posts on oil cooler relocate and came up dry. Purchased a 57 PA 22-20 160 about 4 years ago.During recent annual my mechanic discovered no log book entries on the relocated oil cooler to rear baffle adjacent # 4. Looking for any info and/or STC/337 for this mod to tidy up the logs. Thanks for your time, Geir Andersen ...