Also I wanted to clarify if blinking at oil temp light is strictly an electrical issue or could the transmission actually be getting hot?
A blinking AT Oil Temp light is indicating a detected technical problem. If the ATF is overheating, the warning light normally would come on steady, not blinking. However, if there's both a technical problem and overheating, I don't know if one will take precedence over the other; that is, would the light flash to reflect the technical problem, or come on steady for the excessively hot ATF? (I suspect the former . . .)
Nevertheless, the code 77 is a technical problem, and according to the FSM, indicates that the electrical circuit between the TCM and the lock-up duty solenoid is either open or shorted. In this case the torque converter would, of course, not go into lock-up, and this, in turn, can cause the ATF to get excessively hot. (Most of the transmission heat is generated in the torque converter when the impeller and turbine are not turning at the same speed.)
First step might be to check the lock-up solenoid circuit for continuity. The wiring diagram was posted earlier. (I presume your car does not have VDC, in which case page WI-61 would be relevant.) You'll need to access the TCM connector (B54), and the main connector to the transmission wiring harness (B11/T4). No need to remove the pan etc at this stage.