Change the drive belt and replace the tension spring with minimal disassembly of your mower. This video includes part numbers for both and shows how the spring mounts.
Chapters:
0:00 Intro and overview
1:04 Tension spring breaking and results
2:30 Price comparison from previous replacement
3:38 Fan locations
4:39 What has to be removed
6:20 Belt with part number
6:43 Belt routing
7:25 Tension spring with part number
8:07 Reassembly