If you've obtained your residency through marriage to a Peruvian, be sure that he/she has no outstanding fines. Because my husband was away for work on Election Day, he couldn't vote and was fined S/75 (in Cusco). Migraciones will pull it up in their system. Avoid a second trip and have that squared away before you attempt to renew your C.E. I had my receipt from Banco de la Nacion and all the required documents for my C.E. renewal, so they (very surprisingly) allowed me to submit them... granted I present a copy of the S/75 receipt (proving that my husband paid the election fine) when I returned to pick up my card 10 days later. Easy-peasy.
It was, however, unnerving to not be given a renewal sticker. When I asked for one, they said they no longer issue them, that I could rest assured that it's updated in their system, and that I could check for myself online:
https://www.migraciones.gob.pe/ > Consultas en línea > Carné de Extranjería
After you enter your datos, if your residency is current, all you'll see is this:
PRORROGA DE RESIDENCIA: SU RESIDENCIA SE ENCUENTRA VIGENTE
TASA ANUAL DE EXTRANJERÍA: TAE VIGENTE
No date of when I renewed. No expiration date. That was not very satisfying, especially given the fact that I was due to exit the country within a few days. Without a sticker, I was concerned about passing through migraciones at the Lima airport on my return (I read on this forum that others ran into trouble with LATAM for not having a sticker). So I went back to the migraciones office in Cusco to see if I could have something in writing lest I run into trouble. They told me I won't have any problems, but if I wanted, I could go online and print out the page (mentioned above). Basically useless with no dates. What I plan to do is take a screen shot of the page (with the time and date) on the morning of my flight and carry that with me JUST IN CASE.
I don't recall needing my passport when I renewed my C.E. (but it wouldn't hurt to take it with you). I was required to present an original copy of our Acta de Matrimonio in addition to the documents listed in the previous post (when we obtained the Acta from RENIEC didn't matter. i.e., it didn't matter that it was dated over 3/6/9/12 months).
One last thing, since I knew I'd be out of the country when my C.E. expired, they told me to come in to renew about 20 days before my departure; I renewed it in August.