What was found
INTERMITTENT EMER/PRKG BRAKE ON LIGHT WITH ACCOMPANYING EICAS "PRKG BRK NOT RELEASED" DURING CLIMBOUT. RAN QRH, CONTINUED INTERMITTENT UNTIL LAST 20 MINUTES OF FLIGHT; STAYED EXTINGUISHED. RETURNED TO FIELD. ACCOMPLISHED UNEVENTFUL LANDING. REMOVED FROM SERVICE. FOUND FAULT CODE 32400015UT1 POSTED ON CMC NUMEROUS TIMES. C/W E175 FIM TASK 32-41-00-810-863-A. REMOVED AND REPLACED EMERGENCY/PARKING BRAKE PRESSURE SWITCH 1. REF E175 AMM TASK 32-44-09-000/400-801-A. FUNCTIONAL TEST AND LEAK CHECK OF PRESSURE SWITCH GOOD. EICAS MSG DID NOT ILLUMINATE. A/C RELEASED FOR SERVICE.