Motion to Quash Service of Summons or Motion to Set Aside Judgment on a default judgment civil case for debt collection?

You'd have to first file a Motion to Set Aside the Judgment. A full consultation would be necessary to properly advise you.

Is employer out of line

It may be out of line, but it's not illegal.

Is my LLC protected against former partner's FLSA claims? Former partner claiming wrongful employee classification.

If it is a properly formed and maintained LLC, yes, it should protect you personally.

Is it prudent to sue Real Estate Agent/Listing Office/Listing Agent in addition to landlord when suing for constructive eviction

If you just have a constructive eviction claim, probably does not make sense to sue the realtor.

Tenant above us makes a lot of noise during quiet hours and THE OWNER doesnt do anything about it.

This sounds like a breach of the covenant of quiet enjoyment and/or nuisance. You should have an attorney write a demand letter to the LL and/or...

Is a case centered on Employment issues and Breach of Contract (small business) viable for Pro Bono representation in CA?

This is the type of case that can potentially be taken on a contingency, depending on the facts. A full consultation would be necessary to...

Assuming that you are an at will employee, yes, you can be terminated for this reason.

There are no laws that say this, but your employer can decide it as part of their own policies.

Structuring multiple businesses - should I file a DBA or apply for anot her trademark?

Since this is a separate type of business, it's probably smarter to do a separate LLC and file a trademark for that. A dba doesn't provide full...

Can an associate attorney in a law firm act as attorney for the person who owns the firm?

Yes, this is proper for the associate attorney to do.