well it could be any of these .....
Code Type Designator
E7 2SC5801 - SMD Transistor
E7 KN4L3N - SMD Transistor
E7 NE851M13 - SMD Transistor
E7 NE851M33 - SMD Transistor
or maybe something totally different
I think it is E7, rather than E72 because of the gap between the 7 and the 2
and because I got no hits for E72

the 2 may indicate a manufacturer, year of manufacture etc
Dave