What was found
MASTER CAUTION PRKG BRK NOT RELEASED ON DESCENT THROUGH 14,000 FT. RAN CHECKLIST IAW QRH. REMAINED ILLUMINATED AFTER CHECKLIST BUT SELF EXTINGUISHED AFTER 10 MINUTES NO ISSUES NOTED ON LANDING ROLLOUT. EMERGENCY DECLARED. LANDING UNEVENTFUL. REMOVED FROM SERVICE. COMPLIED WITH APPLICABLE STEPS OF FIM 32-41-00-810-852-A, SUSPECT #1 AND #2 E/PBP SWITCHES TO BE LEAKING INTERNALLY. REMOVED & REPLACED #1 AND #2 E/PB SWITCHES PER AMM TASKS 32-44-09-000-801-A AND 32-44-09-400-801-A, FUNCTIONAL TEST GOOD, NO LEAKS OR FAULTS NOTED. AIRCRAFT RETURNED TO SERVICE.