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Here is the Agilent Resource Center Agilent Resource Center | Agilent and here you can find the user manual and conditioning guide for the GS-OxyPLOT: https://www.agilent.com/cs/library/usermanuals/public/830-4900.pdf
Using the Agilent Application Finder, Application Finder | Agilent you can find an application note on the GS-OxyPLOT that talks about peaks: https://www.agilent.com/cs/library/applications/5990-4493EN.pdf and https://www.agilent.com/cs/library/applications/5989-8771EN.pdf and https://www.agilent.com/cs/library/technicaloverviews/public/5989-6447EN.pdf
Here is a GC troubleshooting video from Agilent, that reviews column troubleshooting as well as potential contaminants: GC Column Installation Video - GC Troubleshooting Series | Agilent and e-Seminar slides that review potential issues as well: https://www.agilent.com/cs/library/eseminars/public/Installation%20Care%20and%20Maintenace%20of%20Capillary%20GC%20Colum…
I hope this helps! If more help or resources are needed, do not hesitate to write back. Thanks!