Nokia 6610 keys 1,4,7 and * Not Functioning

Such damage often occurs because the problem is very mild, usually biased because of dirty or have been too long that eventually the keypad board covered with mold, damage to the keys 1, 4, 7 and * is the path Row 2 is connected to the CPU
If the fourth button does not work then the possibility occurs off line or interference with the IC keypad. See jumpers below technique scheme.