What was found
MDT - FLT 1924 - EN ROUTE FROM ROC TO DCA, F/A NOTIFIED CAPTAIN THAT THERE WAS A STRONG BURNING ELECTRICAL ODOR IN THE CABIN. CAPT MADE A RAPID DESCENT, DECLARED AN EMERGENCY AND DIVERTED TO THE FIRST SUITABLE AIRPORT AT MDT. FLHT LANDED W/O FURTHER INCIDENT AND TAXIED TO THE GATE UNDER ITS OWN POWER. MX FOUND A VERY STRONG ELECT BURNED ODOR FROM ALL 3 TRANSFORMER RECTIFIER UNITS. ALL 3 TRU''''S HAD DUST CLOGGING THE COOLING EXTRACTION VENTS. ELECT SHELF WAS FOUND SCORED ALSO. CLEANED E/E SHELF AND REPLACED ALL 3 TRU''''S AS PRECAUTIONARY PER MM. OPS CHECK GOOD. VISUAL, ODOR AND TOUCH SURVEY OF RESET OF E/E COMPARTMENT WAS NORMAL. ALSO, REPLACED NORMAL EQUIPMENT COOLING BLOWER (P/N 6577-1) AS PRECAUTIO