What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS BOTH AUTO PRESSURE CONTROLLERS FAILED CLIMBING THROUGH 10,000 FT, CABIN DIFF WAS 4.5, CABIN ALTITUDE ZERO. BOTH TRANSFER LOCKOUT AND STDBY ON LIGHTS WERE ON. CABIN PRESSURE WAS DESCENDING AT 1500 FPM OR MORE DOWN. ACCOMPLISHED QRH TRANSFER LOCKOUT AND STBY ON PROCEDURE. BOTH LIGHTS WENT OUT. CABIN CONTINUED TO DESCEND AT 1500 FPM. BOTH LIGHTS CAME BACK ON. SELECTED MANUAL PRESSURE CONTROL FOR THE REST OF THE FLIGHT. MAINTENANCE REPLACED BOTH #1 AND #2 CABIN PRESSURE CONTROLLERS IAW AMM 21-32-03. (SEE SDR # AALA201907039011)