What was found
CLIMBING THROUGH FL230, SMOKE OF MODERATE INTENSITY WAS PROPELLED FROM THE LEFT PILOT SIDE BOTTOM OF THE PANEL TO THE TOP OF THE GLARESHIELD. AFTER APPROXIMATELY 2 SECONDS THE SMOKE DISSIPATED AND DID NOT RETURN. AMBER PFD 1 ANNUNCIATOR BRIEFLY ILLUMINATED WITH THE EVENT. NO FUNCTIONALITY OF AVIONICS WAS LOST. THE SMOKE SMELLED OF ELECTRICAL SOURCE. CORRECTIVE ACTION: REMOVED PFD 1 DUE TO SMOKE FROM PFD 1. THEN INSTALLED CUSTOMER SUPPLIED REPAIRED DISPLAY UNIT. OPS CHECK GOOD. WORK DONE IN REF WITH AMM 34-28-00. NO DEFECTS NOTED.