An interesting situation just came up in our session tonight. Our party cleric was surrounded by four enemies - three of them used Aid Another to assist the fourth on a grapple check, which succeeded.
On his next turn, the cleric wanted to use Sound Burst to kill the guards without attempting to break the grapple first. This is when the question came up - the check for casting while grappled is d20+Cl versus a DC equal to 10 + Grappler's CMB + Spell Level. Would the guards who used Aid Another add their bonuses to that check's DC, or is it specific to the initial grapple?
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From the PRD: "In melee combat, you can help a friend attack or defend by distracting or interfering with an opponent. If you're in position to make a melee attack on an opponent that is engaging a friend in melee combat, you can attempt to aid your friend as a standard action. You make an attack roll against AC 10. If you succeed, your friend gains either a +2 bonus on his next attack roll against that opponent or a +2 bonus to AC against that opponent's next attack (your choice), as long as that attack comes before the beginning of your next turn. Multiple characters can aid the same friend, and similar bonuses stack.
You can also use this standard action to help a friend in other ways, such as when he is affected by a spell, or to assist another character's skill check."
That said the bonus would seemly apply ONLY to the attack in this case and since the cleric is making a concentration check and there is no "attack" roll to be made, then I would say only to the initial grapple which is an "attack"
Thanks for clearing that up, guys. We ended up going with this so I'm glad we didn't do anything wrong. He still failed the check, unfortunately, but two rounds later a bomb sorted that out rather nicely.