As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, VERTICAL SPEED MODE WOULD NOT RESPOND TO ANY INPUTS. `A` SIDE WAS MASTER & A/P `A` ENGAGED. REPLACED NR 1 FMC COMPUTER IAW MM TASKS 34-61-02-000-0801 & 34-61-02-400-801. CROSSLOAD SOFTWARE INAW MM 34-61-00-470-806. VERIFIED SOFTWARE CONFIGURATION IAW MM 34-61-00-750-801. OPS CHECKED FMC SYS IAW MM TASK 34-61-00-710-801.