Sorry for the delay, I work 4 and 3 and was off.
Weve tried the anti collision lights off and no change, one of the first things we tried before my original post.
The mute switch stays muted till you remove battery power, then it reverts back to normal mode.
The weep weep weep heard when battery is on and rotors not in motion is low rotor rpm which id guess is normal when the rotors arent in motion before start.
Ive tried pulling circuit breakers one at a time and avionics off while the aircraft is running and still get the different woowoowooowooo sound which again is muted when the rpm mute switch is activated.
Aircraft is UH-1H 71-20068
Thanks for all the replies.