As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT GATE W/APU AND PACKS ON STRONG ODOR INSIDE CABIN, TAIL CONE AND OUTSIDE NEAR APU COMPARTMENT. SMELL BEST DESCRIBED AS ACRID CHEMICAL BURNING. R/R APU STARTER PER MD90 AMM 49-44. WILL REQ LEAK CHECK. ALSO REQ RELAY R2-63, R2-792 (AMT 794502). R/R LT AND RT SOCKS PER MD90 21-54 . R/R R2-63 AND R2-792 PER MD90 WDM 49-41. RAN APU AND NO SMELL FOUND. ALL OPS AND LEAK CHKS GOOD. "M" PROC REV. MEL PLAC RMVD. (6482320)