Smoke alarms, CO alarms and water heater straps are required by California law when a home is sold. Ask the seller to fix these, not to credit them.
Next steps
Get 2–3 written bids for each Red item before your contingency ends (deadline tool). A real bid beats a guess in any negotiation.
Ask your lender how much seller credit you can use. It can never be more than your closing costs and prepaids (closing cost tool).
Your agent sends the C.A.R. Request for Repair (RR). The seller answers on the RRRR. Don't sign the contingency removal (CR-B) until the answer is in writing.
If the seller does the work, ask for invoices and permits and check it at the final walk-through, 5 days before close. Lowered the price and worried about the appraisal? See low appraisal options.
Many people get this wrong:"The seller has to fix everything." No. California's standard contract sells the home as-is. Your Request for Repair is an ask, and the seller can say yes, no or counter. The exceptions are items required by law (smoke and CO alarms, water heater straps) and repairs your lender or appraiser requires before the loan funds.