Under Civil Code 1950(b), a landlord may only deduct the following items from a tenant's security deposit:
(1) The compensation of a landlord for a tenant's default in the payment of rent.
(2) The repair of damages to the premises, exclusive of ordinary wear and tear, caused by the tenant or by a guest or licensee of the tenant.
(3) The cleaning of the premises upon termination of the tenancy necessary to return the unit to the same level of cleanliness it was in at the inception of the tenancy. (The amendments to this paragraph enacted by the act adding this sentence shall apply only to tenancies for which the tenant's right to occupy begins after January 1, 2003.)
(4) To remedy future defaults by the tenant in any obligation under the rental agreement to restore, replace, or return personal property or appurtenances, exclusive of ordinary wear and tear, if the security deposit is authorized to be applied thereto by the rental agreement.
Under Civil Code 1950.5(g), the landlord must provide an itemized statement of deductions indicating the amount and purpose of each deduction with copies of any invoices for outside work and/or materials. If the landlord or landlords employees did the work, then there should be documentation of the work performed, time spent and hourly rate charged.
For any other charges, you will need to file a small claims action.