As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
During approach the r/h engine bagan to surge and lose power with no annunciators illuminated. A go-around was initiated and an emergency was declared. During the go-around, the engine shut down uncommanded. Maintenance personnel removed and replaced the r/h engine assy. Operational and leak checks were satisfactory and the aircraft was returned to service.