Onmyoji - manga translation

I've been working with Patrick Honnore on transliterating some Siddhaṃ mantras in a manga comic called Onmyoji. It is well known in Japan and has even featured in two feature films, but this will be the first translation into a European language (French). It's work in progress and quite fascinating as the mantras appear to be genuine mantras. However in some cases I've not been able to identify the mantra. I'll post them here and would like to hear from anyone who can identify them.

• oṃ pa dmo dbha vā ya svā hā
• oṃ śu ri ma ri ma ma ri ma ri śu śu ri svā hā
• oṃ a mṛ to dbha va hūṃ pha ṭ svā hā (I think this is a Hayagrīva mantra)

Ring any bells?

Mystery Mantra

This photo is one of several taken by Dharmacari Abhayanaga on pilgrimage in Sikkhim, and which I've used on the Avalokiteśvara page. It has a mantra I haven't been able to identify. It's the one in the middle and reads, as far as I can make out:

oṃ ā ma ra ṇi dzi wa na te ye swa ha

Can anyone help me with this?

13/12. It's all right. I've figured it out. It is the Amitāyus mantra.