Add another Condition Column to Sumproduct formula

This is my working formula

=SUMPRODUCT(--($R$3:$R$28=88398),N$3:N$28,$P$3:$P$28)

I want to make it an OR condition by having $R$3:$R$28=88676 as another option. I've tried the following formula.

=SUMPRODUCT(-(IF($R$3:$R$28=88676,(O$3:O$28),1),IF($R$3:$R$28=88676,($P$3:$P$28),1)))

and

=SUMPRODUCT(OR(--($R$3:$R$28=88398),(--($S$3:$S$28=88398)),N$3:N$28,$P$3:$P$28))

I'm getting a value error and can't figure out where the problem is.

Any help is appreciated.

Thanks,
BDB