7.3 injector tubes assorted oil leaks

[sirc59]

have 1999 f450 s/d 7.3 powerstroke at work that formans that diesel fuel shows up in rad have good idea that the injector tubes are leaking can they be done in the truck .Also have the removal and install tools for injectors . The rear main and oil pan both leak both leak looks like good idea for eng pull

1 pull heads install new injector tubes with heads off raise eng up remove trans and oil pan and rear seal ?

2. pull eng eng stand it and do all the repairs out of truck ?

any ideas or info thanks noel

[95powerstroke5spd]

Call me dumb but what are injector tubes???