What was found
AFTER STARTING APU & DISCONNECTING GROUND POWER, CREW & PAX SAW & SMELLED SMOKE. WAS WHITE & HAD A BURNING ELECT ODOR. APU SHUTDOWN AUTOMATICALLY & CREW POWERED DOWN ADDITIONAL SYS. PERFORMED APU MAGNETIC CHIP DETECTOR INSP, FOUND METAL ON COMPRESSION BEARING & DRAIN CHIP DETECTOR. REMOVED APU IAW AMM 49-11-01-004-001. INSTALLED APU UP TO & INCLUDING STEP F(43) IAW AMM 49-11-01-404-246. C/W RII REQUIREMENTS FOR INSTALLATION OF APU UP TO & INCLUDING STEP F(43) IAW AMM 49-11-01-404-246. PERFORMED APU INSTALLATION FROM STEP F(43) IAW AMM 49-11-01-404-246 TO COMPLETION. PERFORMED OPS & LEAK CHKD IAW AMM 49-11-00-802-001. NO LEAKS OR FAULTS NOTED. OK TO CONTINUE C/W RII INSP OF APU OPS. & LEAK CHKD GOOD.