Your diagnostics sounds about right......
My free wheel pulley also siezed a couple of years ago, but it sounded more like a rumbling sound @ idle.
As a side note, you don't need to remove the alternator to remove the pulley - as long as you have the special removal tool, which saves a lot of time & hassle.
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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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