Well if it does have 4 members and K1s were issued then you would need to amend the 1065.
You have two options to amend:
1. Report the cash payments by you and your partners as loans at PLLC level, not capital contributions. (PLLC owes you these funds back) This is probably the simplest approach. If the cash payments were greater than 10K this would not be advisable as IRS will consider this a below market rate loan and require you to charge the PLLC interest on the loans.
2. Report the payments as capital contributions from the PA's. On the PA books record the cash contribution as:
DR to due from member (a receivable) $12345
CR capital contribution $12345
Next you need to reverse the due from member to account for the contribution to the PLLC:
DR investment in PLLC $12345
CR due to from member (receivable) $12345
Now you would have zeroed out the member receivable account, recorded the capital contribution, and also recorded the investment in the PLLC.
On the PLLC's books record the payments received by you and your partner as capital contributions from the PA's, not yourselves personally. (the is the DR investment in PLLC $12345 transaction)
I hope this makes sense.
Let me know if you have any further questions.