As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN POWER WAS TRANSFERED TO APU POWER PWS FAIL ILLUMINATED. ACFT GROUNDED. VERIFIED ALL RADAR & TERRAIN BUSES ARE ACTIVE AND VALID. UNABLE TO CLEAR PWS FAIL. RADAR RT FAILS SELF TEST WITH WEATHER RADAR TRANSCEIVER & PWS FAIL ANNUNCIATED AT END OF TEST. R & R WEATHER RADAR TRANSCEIVER IAW AMM 34-43-41. SYS OPS CHECKED OK.