In Re Romero

OPINION

DUNCAN, Justice.

Emilio Romero seeks a writ of mandamus to compel the trial court to set aside a modification order because the order, signed after the expiration of the trial couri/s plenary power, is void. 2 We hold the trial court’s modification: order was signed within the period of its plenary power because it modified an order that was itself interloeutoiy since it did not expressly or by necessary implication dispose of a pending subrogation claim. Therefore, to the extent the modification order purports to reinstate an already-pending case, it is ineffective, not void.…