Help: Squeeky leaf springs

Well, went fishing and it had plenty of squeaks going over small bumps and rocks. I again tried to duplicate the squeaks jumping up and down on either side of the rear bumper and then pushing and pulling side to side on the rear of the bed. Could not get a squeak. So thinking it's in the spring bushings and needs to be a fast jolt unlike my test. I might try some WD40 at the bushing areas and see what happens.
 
TSB #T-SB-0273-17_Rev

TSB: REVISION NOTICE October 13, 2017 Rev1: ? The Warranty Information and Repair Procedure sections have been updated. Some 2016 ? 2017 model year Tacoma vehicles may exhibit a squeak noise from the rear leaf spring
 
TSB #T-SB-0273-17_Rev

TSB: REVISION NOTICE October 13, 2017 Rev1: ? The Warranty Information and Repair Procedure sections have been updated. Some 2016 ? 2017 model year Tacoma vehicles may exhibit a squeak noise from the rear leaf spring

What about the 2015 and earlier models?
 
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