if however. one apprehends genuinely that the testator had intentionally or unintentionally done some injustice and then alters the will to set things right between the parties concerned in that case he does not incur any sin. allah is forgiving and merciful.
فمن خاف من موص جنفا أو إثما فأصلح بينهم فلا إثم عليه إن الله غفور رحيم