The Five Great Hearts Mantra, contained in the Surangama mantra, is easily found online in the Chinese version:
Chr Two Ni
E Jya La
Mi Li Jyu
Bwo Li Dan La Ye
Ning Jye Li
But the original Sanskrit version is almost impossible to find. Someone on this forum, on another topic, gave it as (with line numbers from the full Surangama Mantra):
Which comes out to
Chedana Akala Mrtyu Prasamana Karim
But I want to dedicate this topic to finding, with certainty, what the original and correct Sanskrit Five Great Hearts Mantra is.
This is an important and worthwhile pursuit.