What was found
SMOKE TOILET AT FL310 ON DECENT GOT OXY PRESS LOW?. PACK 1 WAS SHOWING 120 DEGREES C. WAS EXCESSIVELY HOT AND SMOKE IN PLANE / CABIN. (FLIGHT 4644 - FILED CLOSED) REFER TO AML1503487 FOR THE SERVICING OF THE CREW O2 SYSTEM ( MASKS WERE DAWNED DURING SMOKE IN CABIN EVENT)REFER TO AML LOG 1503488 FOR REMOVAL AND REPLACEMENT OF NO. 1 ACM DUE TO OVER TEMPING. REFER TO AML 1504119 FOR OPERATIONAL AND CHECK OF THE NO. 1 ACM. REFER TO AML 1504300 FOR OIL LEAK CHECK OF THE NO. 1 ACM.REFER TO AML 1504176 FOR REMOVAL AND REPLACEMENT OF THE NO. 1 ACM COALESCER. INSPECTED THE NO. 1 ENGINE EXTERNAL A SUMP DRAIN HOLE AT THE 6 O'CLOCK POSITION FOR SIGNS OF OIL LEAKAGE - NO LEAKS OR WETNESS NOTED. COMPLIED WITH CRJ 200 FIM 21-21-00 TO VERIFY NO SMELL OF SMOKE OR ABNORMAL SMELLS REMAIN IN THE COCKPIT, CABIN, AND LAVATORY - NO UNUSUAL ODORS OR SMELLS NOTED THROUGHOUT COCKPIT, CABIN, AND LAVATORY DURING ALL POWER SETTINGS UTILIZING ALL AVAILABLE BLEED SOURCE CONFIGURATIONS TO PRESSURIZE BOTH THE LEFT AND RIGHT PACKS.DURING ENGINE RUNS / ACM OPS CHECKS THE LEFT PACK WAS FOUND TO BE UNCONTROLLABLE IN AUTO MODE - THE DUCT DISCHARGE TEMPERATURE INDICATION WAS RAPIDLY APPROACHING 100C