That business was auto repair and a sole proprietorship and it is out of business since Jan 1995 when I received a Chapter 7 discharge.
In the year 2000, I started a new computer business (a C corporation), 5 years after the auto repair business went under. EDD has not contacted me for at least 10 years, then out of the blue I get this bill for $150K + a message to call them to discuss my options. I understand that employment taxes are not dischargeable to me personally. So I agree that EDD can EWOT and garnish my wages from my corporation or levy my personal bank account, but can they also levy the C corporation bank account? At this time I am the sole signer on the corporation bank account and the sole stockholder.
Agreed - you must use an attorney. You may be able to use the same attorney (assuming you had one) who set up the corp and/or call your accountant who presumably helps you file taxes. You should also contact the service you use for payroll as they may also be helpful, if you are being asked for payroll taxes that were not paid.
Regardless, you should seek counsel asap.
This is my opinion and should not be construed as legal advise for your specific case as there are many more facts which you have not provided.