As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
45 MINUTES INTO OUR FLIGHT PBI-MMUN, EMERGENCY CABIN LIGJTS TURNED ON AND STAYED ON WORH TJE EMER LT IN THE ARM POSITION. 10 MINUTES BEFORE LANDING LIGJTS STARTED FLICKERING. REMOVED SUSPECTED DEFECTIVE EMERGENCY BATTERY #2 AND INSTALLED CUSTOMER SUPPLIED TESTED EMERGENCY BATTERY IAW MM 33-52-01. COMPLETED OPS CHECK OF THE #2 EMERGENCY BATTERY ALL STEPS COMPLETED AND PASSED MM 33-52-01.