What was found
PASSENGER DOOR WARNING IN FLIGHT / INTERROGATED MDC AND FOUND FAULT CODES FOR PAX DOOR SENSORS PX101 AND PX107. FOUND CIRCUIT BREAKERS R8 AND R9 ON CBP2 (DOOR IND 1 AND DOOR IND 2) TO BE POPPED. INVESTIGATED AND FOUND THAT PX101 AND PX107 SHARE POWER GOING THROUGH SPLICE SP528 PER CRJ900 WDM 52-70-02. WHILE ATTEMPTING TO DE-PIN THE SPLICE, FOUND WIRE FOR PX107 TO BE BROKEN AND PULLED OUT OF THE SPLICE. SUSPECT THE WIRE CAUSED A SHORT IN THE SPLICE WHICH CAUSED BOTH CIRCUIT BREAKERS TO POP CAUSING PAX DOOR AND AFT CARGO DOOR IND ISSUES. REMOVED AND REPLACED SPLICE SP528 IAW CRJ900 ESPM 20-16-00. ALL OPS CHECKS GOOD IAW CRJ900 AMM 52-11-00-710-801-A01.