I've not heard of a roller siezing before, usually they rattle and move around on their spindle (as mine did).
You can bet that the other idle roller and the tensioning roller will be candidates for replacing too if one has already failed.
Just be carefull when you torque up the bolts - DONT use the torque specs in Dempsy's 101 Projects for your Boxster book, they are wrong. I know from hard experience .......
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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