Need assistance with end gcode

[Juice]

So, i have a problem where some of the PLA filament that i use isn't of the best quality and if it sits idle in my extruder for more than a few minutes, it often snaps, leaving me with the task of extracting the broken pieces. To mitigate that problem, I've simply added the needed length of retraction to my end gcode, but this retracts the filament at printing temperature and thus leaves strings. I need the nozzle temperature to be a little lower before retraction.
I'm looking for gcode that will lower the nozzle temperature to a specific value before retracting and shutting down other parts of the printer. Any help would be appreciated.
Thanks

[Phaedrux]

https://duet3d.dozuki.com/Wiki/Gcode#Section_M109_Set_Extruder_Temperature_and_Wait

[Juice]

@Phaedrux Thanks!