R129 Air / Squeal noise above 60mph.

[atlantimd]

Hi I have a 1996 Sl320 put it on the road after 6 months off. There is a squeal from behind left hand side of the dash when going above 60mph. It is worse with the soft top down. I have checked under the cabin filter and nothing trapped flaps working ok.
Any Ideas?
Can't find the cause.

 

[atlantimd]

I checked to bottom of windscreen for de bonding and it’s ok. It’s a loud high pitched squeel