You really should consult with a real estate lawyer. Please do so right away. Bring your contract and all addendums, and put your question to him. If you don't close in 2 days, their lawyer will probably send you something called a "time is of the essence" letter - your lawyer will explain what this means to you - in perspective to everything else.
One thing you mentioned is most curious. The bit about "they have not paid for any repairs yet". It implies that they either need to do things to get the CO (certificate of occupancy) - and/or - they agreed to do other repairs in some kind of adendum after your inspection was complete.
I don't know your state law. If they just don't do what they committed to, it might be that the escrow company will merely hold their money until it's done or it might be that they are actually in breach of contract at time of final walk-through or day of closing. You need proper legal advice.
Good luck to you! Sorry for the situation.
Did both you & the sellers initial the liquidated damages clause in the contract? If so, the likely maximum the seller can sue you for would be 3-1/2% of the purchase price - it would state the actual percentage on your contract. The amount the seller can sue you for for breaching the agreement would be capped at that amount.
Hopefully this helps - please email me at firstname.lastname@example.org if you have any other questions.
Coldwell Banker Residential Brokerage
15490 Ventura Blvd.
Sherman Oaks, CA 91403