Replacement becomes mandatory when drum assemblies exceed 50-percent of original appliance value
https://urgentappliancerepairsac-local-sac-near-freedom-park4960.inkharbory.com/posts/identifying-motor-breakdown-signals-means-planning-for-2-6-week-replacement-delays
The drum assembly is the most expensive component to replace on a dryer because it houses the internal structure that must meet strict load-bearing and thermal safety limits set by manufacturers and regulatory bodies