What was found
CLIMBING OUT, AT FL 250 NR 2 MULTIPURPOSE CONTROL & DISPLAY UNIT (MCDU) FAILED SENDING SMOKE & A STRONG BURNING ODOR THROUGHOUT COCKPIT. PULLED NR 2 FMGC & NR 2 MCDU CIRCUIT BREAKERS & DONNED 02 MASKS. SMOKE DISSIPATED, REMOVED 02 MASKS, & CONTINUED FLT UNDER NORMAL OPERATING CONDITIONS. MX R & R NR 2 MCDU IAW AMM 22-82-12-04. ACCEPTANCE TEST CONFIRMED FAILURE OF MCDU. FOUND POWER SUPPLY MODULE BURNED AND FUSE BLOWN, REPLACED POWER SUPPLY MODULE AND FUSE. UNIT REPAIRED AND RETESTED IAW CMM 22-82-03A, REV. 00, AND CMM 22-82-03, REV. 02.