Q: Q: What are my issues?

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Light squeals while moving 5 hours north to upper michigan, arrived and went to start vehicle, Light squeals turned to screams from front serp belt area. I lubed behind pulleys, started jeep, smoke I thought was from lube, until serp belt snapped after I shut it off. Found burnt rubber buildup on alternator pulley and alternator pulley is froze in place. I Bought new serp belt but have not replaced yet because I feel alt needs replacement. What else should I check before pulling and replacing alternator?

My car has 153000 miles.
My car has an automatic transmission.

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