** I wonder if this advice would also be for a squeak when the drum is rolling. Mine is only 2 years old and it is a Kenmore. **
"Kenmore" products are made by a number of different manufacturers, the most common maker of their laundry products is Whirlpool. On Whirlpool build dryers, there is no rear drum bearing (at least not on models made in the last 20+ years) so that would not be the cause in your case. The most common causes of squeaking on modern Whirlpool built dryers are worn drum rollers or a worn idler pulley.