Grewal asks for a senate post
The first he-said/she-said exchange in the Grewal episode came when Grewal claimed that the Liberals had offered a senate post to his wife if the two of them crossed the floor and became Liberals. For the first two weeks of the controversy, there was no clear answer, even after the Conservatives released what they claimed was all the tapes.
Those tapes, as we all know now, were altered, and the episode in which a senate seat was discussed was one of the places where something had dropped out. That occurred during Grewal's meeting with Dosanjh and Murphy. To get a sense of what else dropped out, see my slideshow.
Here is one image from that slide show on p. 13 that clearly answers the question of who was telling the truth about the senate seat.
In fact, you don't have to believe your eyes, since you can hear Grewal's request for yourself by clicking here. (Download it here.) (Thanks to Ryan for his help with this.)
So, who asked for the senate seat? Grewal. He even admits that Dosanjh had advised him not to make such a request. What was the Liberal answer? That they had no such seat to offer. Who was lying? Grewal. Who was telling the truth about this fact, at least? Apparently the Liberals. (Hey, there's got to be a first time for everything!)
And what is that yellow? Those are the parts that were left out of the first version of the tapes that the Conservatives released. Why? Because it showed that Grewal was lying.