What was found
TEN SECS AFTER RT ENGINE START, LT ENGINE RUNNING, EICAS RT WINDSHIELD HEAT INOP AMBER MESSAGE ILLUMINATED FOLLOWED BY AN ELECTRICAL ODOR & LIGHT SMOKE IN COCKPIT. ENGINES & APU SHUTDOWN. POWERED ACFT, STBY SFD POWERS UP BOTH AIRSPEED & ALT TURNED RED & FAILED. POWERED FAILURES STOPPED & DID NOT RETURN. TROUBLESHOT SFD & ADU IAW MM 34-00-00-910-901. DURING BIT TEST, SFD & ADU PASSING SELF-TEST BUT BOTH SFD & ADU FAILED. PURGED STBY PITOT SYS. REMOVED FAILED SFD & INSTALLED REPAIRED UNIT IAW MM 34-23-01-900-801. REMOVED FAILED ADU & INSTALLED REPAIRED UNIT IAW MM 34-23-05-900-801. BIT TESTED IAW MM 34-00-00-910-901. ADU & SFD SELF-TESTS PASSED. LEAK TESTED STBY AIR DATA SYS IAW MM 34-11-00-790-801.