T2 is GND, T5 is connected to pin 6 of the SOIC8 package (if you look closely, you can see the trace).
T8 is SDA, T5 is SCL. This is the I2C bus which connects the eeprom chip to the display driver.
(EEPROM chip: http://www.8051projects.net/e107_files/public/1339238201_38804_FT55741_24c02.pdf)
T4 would be interesting to know what they do.
At any rate, I recon the display itself shouldn't be difficult to integrate with. If you were to connect each of the 16 display pins to an arduino pin, and then cycle through each possible combination of pins, you could probably find out how all the pins relate to the segments of the display. Perhaps do it in a binary sequence.