NAVISTAR IS RECALLING 51,588 HEAVY TRUCKS, COMMERCIAL BUSES AND SCHOOL BUSES MANUFACTURED BETWEEN NOVEMBER 21, 2000 AND MAY 21, 2008, EQUIPPED WITH ONE OR MORE REMOTE POWER MODULES. THE POTTING MATERIAL THAT ENCAPSULATES THE CIRCUIT BOARD OF THE VEHICLE’S REMOTE POWER MODULE MAY NOT SUFFICIENTLY SEAL THE CIRCUIT BOARD FROM WATER AND CONTAMINATION INTRUSION. IF THE ENCAPSULATION IS COMPROMISED, WATER AND CONTAMINANTS MAY CAUSE AN INTERNAL ELECTRICAL SHORT, POSSIBLY RESULTING IN A FIRE.