AOI OM Octo housing vac issue

A good friend and dive buddy purchased one of these new along with an OM camera, lenses, UWL-09Pro and a macro lens. He used it in the fall in Roatan and the vac system never reliably gave a green light and would flash red. He dived the rig anyways and enjoyed it but for the lack of vacuum system function. He returned and sent it back to----- who then charged him several hundred dollars to repair the faulty system on a brand new out of the box unit. Now, the past two weeks, back in Roatan, same thing. Out of 40 dives he got a steady green light maybe three times. And the flash trigger went dead several dives!

Is this a known issue? Is there a fix or special technique or is this brand new, now repaired once already ($$) and still not working housing just in need of some more repairs?