I've experienced that whistle from the regulators on our rig, even on a BBQ grill, and it seems to have eventually gone away after a time and doesn't seem to cause any problems. If you can isolate the noise to one of the regulators and want to, just replace the regulator that makes the noise.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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