See attached files for 7615 schematics and drawings that can assist with troubleshooting.
See this article for control troubleshooting, 7615 Control Troubleshooting
Here is a link to an Article about the rupture discs, 7615 Rupture Disc
Here is a link to an Article showing the System, Reservoir, Isolation Valve and part number for it, 7615 High Pressure Valve
There are two attachments (below) available for download:
- "7615 Call Outs.pdf" -- a photo of the 7615 inside calling out key components.
- "Schematic 7615 Nov2015" -- annotated pneumatic schematic.