Crackling sound in the engine compartment - 2005 Cadillac STS

2005 cadillac sts v6 I have a crackling sound in the engine compartment can"t figure it out. does anyone else have this problem 92,000 miles. Thanks

Could be the tensioner and pulley for the serpentine belt.

Hope it’s not a timing chain guide breaking apart causing that noise.

Tester