As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH NAVIGATION UNITS FAILED SIMULTANEOUSLY AFTER FLYING THROUGH PRECIPITATION. AFTER 15 TO 20 MINUTES BOTH UNITS, WITHIN 15 SECONDS OF EACH OTHER, BEGAN TO OPERATE NORMALLY. *S/D* REPLACED ALL STATIC WICKS PART NUMBERS D/G740007 AND 740001. NO FURTHER PROBLEMS.