As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2299. DURING CLIMB ENG 2 AND 1 FIREEXBTL FAIL MSSG APPEARED. MSSG APEARED AND DISSAPEARED 4 TIMES ON CLIMBOUT AND STAYED ON DURING CRUISE. DIVERTED AND HAD A UNEVENTFUL LANDING. REMOVED FROM SERVICE. C/W FIM 26-21-00-810-810-A. PARA 1-7 F R.OSBORNE 1036539 4-6-26. PERFORMED FIM 26-21-00-810-810-A PARA 7 G - I. ENGINE FIRE EXT BOTTLE B DID NOT PASS ELECTRICAL TEST REF E175 AMM 26-21-03-720-802-A. REMOVED AND REPLACED ENGINE FIRE EXT BOTTLE B REF AMM 26-21-03-000-801-A 26-21-400-801-A. OPS CHECK GOOD.