Other issues can be present in addition to plumbing, ie; electrical, foundation, structural framing, etc... Whenever you're unable to inspect a crawl space list it as being partially, substantially or completely inaccessible. Don't advise to call a plumber unless you know there's a problem. If the owner were to find an electrical problem they'll state you advised them to call a plumber not an electrician, etc...
Did it show up on the termite report? Did the termite inspection access it?
Sample Verbiage when an issue is noted during inspection - "Allen Insurance":
1. Refer to an independent licensed plumbing contractor for further inspection/service as needed to ensure plumbing systems integrity prior to close of escrow.
2. Sub area was completely inaccessible due to substandard service access and and or limited framing clearance above grade. The area was NOT inspected and is NOT included in the inspection and or report as a result of same.
Thanks for all this verbiage !!! It will definitely use it for all future
Inspections...
