What was found
RIGHT "BLEED AIR TRIP' LIGHT ILLUMINATED. FL 260, RIGHT DUCT PRESSURE DROPPED TO 5 PSI. RESET TRIP SWITCH PUSHED DUCT PRESSURE RESTORED BRIEFLY LIGHT EXTINGUISHED FOR 1 SECOND THEN REILLUMINATED. IT REMAINED ON FOR THE DURATION OF THE FLIGHT. DIVERSION TIME 22 MIN. VERIFIED FAULT BLEED TRIP LT REMAINED ILLUM & WOULD NOT RESET W/ENG SHUTDOWN DISCONN 490 OVHT SW BLEED AIR TRIP LT RESET. REMOVED AND REPLACED 490 OVHT SW IAW 36 11 08 000 801 & PERFORMED REPAIR CONFIRMATION PER FIM TASK 36 10 00 810 801.