You didn't say if you have removed the plastic inside door panel for a close-up look, but replacing the bolt portion is likely within the capabilities of your friendly local locksmith.
We removed ours to clean all the various mechanisms (amazing how much dirt had collected in there. As I recall, our dead bolt throw bar is riveted to the pantograph type throw.
With hourly rates, may not be a money saver over buying a new assembly and popping it in yourself. But, an option.
When we bought our "new to us", the driver side fuel door lock was fubar. The two fuel door locks and the deadbolt were keyed the same. The lower lock and cargo door locks were keyed the same. And, as Eagle says, the keyless entry only operates the lower door lock and the cargo door locks.
We called the locksmith that re-keys our houses between tenants. He popped out the fubar core and put in a new one. Then we had him key the deadbolt and other fuel door to the new fuel door key. Simple (to him
) matter of tumbler pins. He was in and out in 1 1\2 hrs. We have security from keys only we and he had touched.
IMHO, particularly as it is an "all or nothing" system on the cargo doors, the keyless entry lacks utility. Our key fob batteries died. It is not worth two $7 batteries to breathe life into it. Other folks opinions may differ.
Fair Winds and Following Seas