The green stuff sounds like just corrosion, my guess is that it is on the ones with the soldered leads where the flux has not been fully cleaned off after soldering and this is common with age, Do a full charge (14 hours trickle charge at 240mA) to balance the cells and then discharge to 0.8 Volts per cell, if the cells in question are the same as the others after discharge then they will be fine, if they have been damaged then the voltage will be much less (could even be negative).