As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RADIO ALT (CAPTS) SHOWED 2000 AGL WHILE 10000 MSL. THIS WAS FOLLOWED BY A GPWAS PULL UP WARNING AND THEN ELECTRICAL SMOKE IN THE COCKPIT. PULLED CAPTS R/A CB SMOKE DISSIPATED AFTER RUNNING CK LIST LANDED NORMALLY. REPLACED CAPTS R/A IND AND NR 1 R/A TRANSCVR RAN BOTH PACKS AND GND OPS CKS OK.