Tenant moved out, now I have $8000 repair needed

[Peter Sik]

I owned a rental property in Adelanto, CA. Monthly rental income raised to $1000, $600 security deposit. 

This tenant leased for 6 years and just moved out last week. So my PM done the inspection there. Found out I have like $8000 repair needed. This is insane....  

Left a lot of trash there and the removal fee is $1040!!

Here is what I am going to do:

1. Ask my house flipping friend to coordinate all the repairs, hope can cut down the cost.

2. Tell the PM to replace AC filer every quarter and ask tenant what needs to be repair and have condition checkup.

I don't have such experience to deal with large repairs. Want to hear your suggestion on what should I do with PM and tenant. Should I apply a claim to the tenant?  Thanks in advance