fluke 726 repair help

[janosky]

 Hello good day, I have a problem with a fluke model 726 process calibrator, the instrument had a fault in the integrated LT1373
(250kHz Low Supply Current High Efficiency 1.5A Switching Regulator) which was changed, however the equipment turns on but shows a battery icon which marks that it is low and turns off the instrument, clearly the batteries are good and also perform the tests with a power source to rule this out and the fault is the same, if any user of this forum has experience in repairing this equipment or any notion of where the revision should continue, I would greatly appreciate it since it is a very expensive equipment to dispose of and I need it for daily use , Thanks a lot 

[Ugur]

Hello,
Can you check these parts?
D5-D7-D4-D10-D37-D11
Q5-Q9
U2-U23