What was found
(CAN) DURING DOOR WARNING PROBLEM WITH AIRCRAFT ON DESCENT, THE OXYGEN MASKS WERE DEPLOYED. MASKS, ROWS 5 TO 13, FAILED TO DEPLOY. CIRCUIT BREAKER HAD TRIPPED ON THE LEFT SIDE CONTROL WHEN MASKS DID NOT DEPLOY . INVESTIGATION SHOWED THAT ROW 13AB SOLENOID LATCH MECHANISM WAS SHORTED CAUSING CIRCUIT BREAKER TO TRIP. THIS ALSO HAPPENED TO ANOTHER AIRCRAFT. THERE IS A MANUAL DEPLOY CHECK CALLED UP EVERY 24 MONTHS. THESE 2 AIRCRAFT HAD BEEN DONE WITHIN THE TIME FRAME. FURTHER CHECKS REQUESTED.