Epilogue: Turns out this is not covered under warranty. The failure occurred right at the seam where the drum was welded together. Total fee to replace this drum, part and labor, is over $400. I recommended that the customer purchase a new Whirlpool dryer with a lint filter on the top panel and no electronic controls, just knobs and switches, available at Sears for less than $500. She's going to go that route.
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