Describe the bits -
a) Dark paste = bearing outer race spinning in housing
b) Shiny thin pieces with jagged edge possibly flower shaped and maybe slightly dished = ball bearing failure
c) Slivers and some black paste = gear failure
d) Nothing on detector but light ON when detector installed = broken gear tooth and part is too big to fit out through detector fitting (no joke). Have seen the same on Allison RGB and 500C MGB - parts too big to fit out through the chip detector hole.
As always refer to Aircraft Maintenance manual for the final say. Relatively cheap and easy gearbox to repair, is the same as 300C and interchangeable, but beware different and lower finite lives on the gears if it has been used on a 300.