As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN SMOKE AT GATE. APU WAS THE POWER SOURCE. PLACED ON MEL 49-10-1B. PERFORMED GVI OF APU FOR OIL LEAKS ON EXTERIOR AND IN APU EXHAUST CONE. NO DEFECTS FOUND. C/W APU BORESCOPE S/N 99141000051 IAW AMM 49-20-00 PAGE 601-620 TASK 49-20-00-290-801. NO DEFECTS NOTED. REPLACED THE RT ACM, RAN APU AND C/W OPS TEST OF AC DISTRIBUTION SYSTEM PER AMM 21-51-00-710-801, OPS CHECK GOOD, NO CABIN SMOKE NOTED. RETURNED TO SERVICE.