What legal responsibilities does a new landlord have?

The duplex we have been living in for 5 years was just sold.
The sale closed a week ago. Our lease is still good until October 1st.
However, we have not seen or heard from this new landlady at all.
We don’t have any contact information for her either.

The bathroom pipes over our kitchen are leaking (not horribly yet) and we need to get ahold of her asap.

We have called our old landlord to see if he can give us the real estate agents name, and perhaps they can give us her contact info. We have her name, but that’s. it.

Is there some legal liability that she has to contact us within a certain time?

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